LED V CFL.

I

Ian Field

Guest
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a typical
18W CFL.

So 3 bulbs at Ł13 each and 27W to equal the (already substandard) light of
an 18W CFL, I'd say they still have some way to go.

A recent issue of EPE magazine (relies almost exclusively on handed down SC
articles) reported that Tesco had LED 'bulbs' at Ł20 each - one might
reasonably expect more lumens at that price than the offerings I found in
Sainsbury's, but I've not been there and had a look yet.

In any case, I think I'll wait for the technology to ripen a bit more for a
while longer.
 
On 16-Mar-12 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a typical
18W CFL.

So 3 bulbs at Ł13 each and 27W to equal the (already substandard) light of
an 18W CFL, I'd say they still have some way to go.

A recent issue of EPE magazine (relies almost exclusively on handed down SC
articles) reported that Tesco had LED 'bulbs' at Ł20 each - one might
reasonably expect more lumens at that price than the offerings I found in
Sainsbury's, but I've not been there and had a look yet.

In any case, I think I'll wait for the technology to ripen a bit more for a
while longer.
Click to expand...
I visited this subject 12 or 18 months ago Ian, and found much the same
as you.

LEDs for general lighting are over priced, under powered, and need a lot
of development before they are in the same ball park. The colour output
is horrible for general use as well.

A friend of mine got some 12 Volt units to replace his power hungry down
lights, and found they were great for this purpose. They are running
nice and cool, compared to the little radiators he was running beforehand.

Cheers Don...

=======================

--
Don McKenzie

Dontronics: http://www.dontronics-shop.com/

The World's Cheapest Computer:
DuinoMite the PIC32 $30 Basic Computer-MicroController
http://www.dontronics-shop.com/the-maximite-computer.html
Just add a VGA monitor or TV, and PS2 Keyboard.
Arduino Shield, Programmed in Basic, or C.
 
"Don McKenzie" <5V@2.5A> wrote in message
news:9sf592Fuk6U1@mid.individual.net...
On 16-Mar-12 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

So 3 bulbs at Ł13 each and 27W to equal the (already substandard) light
of
an 18W CFL, I'd say they still have some way to go.

A recent issue of EPE magazine (relies almost exclusively on handed down
SC
articles) reported that Tesco had LED 'bulbs' at Ł20 each - one might
reasonably expect more lumens at that price than the offerings I found in
Sainsbury's, but I've not been there and had a look yet.

In any case, I think I'll wait for the technology to ripen a bit more for
a
while longer.

I visited this subject 12 or 18 months ago Ian, and found much the same as
you.

LEDs for general lighting are over priced, under powered, and need a lot
of development before they are in the same ball park. The colour output is
horrible for general use as well.

A friend of mine got some 12 Volt units to replace his power hungry down
lights, and found they were great for this purpose. They are running nice
and cool, compared to the little radiators he was running beforehand.

Cheers Don...

=======================
Click to expand...
Last year I scrounged a couple of 3-bulb light fittings on freecycle, once
my flat has been refurbed so I can put them up its a chance to try out
various mixes of LED/CFL - but not before the price has fallen a fair bit
further.
 
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a typical
18W CFL.
Click to expand...
**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS
~ 265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and
cool white) and 560 Lumen for warm white, at $42.57 in one off
quantities. 10 off quantities, the price falls to $38.31. Better prices
could likely be found without much difficulty.

So 3 bulbs at Ł13 each and 27W to equal the (already substandard) light of
an 18W CFL, I'd say they still have some way to go.
Click to expand...
**There are CFLs and CFLs. Some are shockers and some are quite decent.
All the ones I use have lasted extremely well and exhibit a pleasing
colour temperature.

A recent issue of EPE magazine (relies almost exclusively on handed down SC
articles) reported that Tesco had LED 'bulbs' at Ł20 each - one might
reasonably expect more lumens at that price than the offerings I found in
Sainsbury's, but I've not been there and had a look yet.

In any case, I think I'll wait for the technology to ripen a bit more for a
while longer.
Click to expand...
**Fair enough. I'm doing likewise, though I've already fitted several
around my home. Reading lamps for my bed were 40 Watt halogens. I've
replaced them with 4.5 Watt LED. The result is that the more focussed
beam is better for my partner (or me) when reading, due to less light
spillover and increased light available on the page. I'm experimenting
with these:

http://www.dealextreme.com/p/12w-3500k-800lm-warm-white-led-emitter-metal-strip-12-14v-80310

Very impressive. Of course, heat sinking must be arranged, along with an
appropriate current source, but the light output is both pleasing and
impressive. At 800ma @ 12 Volts, the light is almost double the
intensity in comparison to an 11 Watt T5 fluoro. Not only directly
beneath the lamp, but also at off-axis positions as well.

Most recently, I acquired one of these:

http://www.dealextreme.com/p/prime-100w-8000lm-led-emitter-metal-plate-pure-white-42806

When I have time, I'll take some comparative photos and measurements
beside a 500 Watt halogen flood (yes, it is that impressive). I'm
presently experimenting with suitable heat sinks. An AMD Athlon heat
sink looks about right.


--
Trevor Wilson www.rageaudio.com.au
 
On 16/03/2012 10:02 AM, Trevor Wilson wrote:

spillover and increased light available on the page. I'm experimenting
with these:

http://www.dealextreme.com/p/12w-3500k-800lm-warm-white-led-emitter-metal-strip-12-14v-80310


Very impressive. Of course, heat sinking must be arranged, along with an
appropriate current source, but the light output is both pleasing and
impressive. At 800ma @ 12 Volts, the light is almost double the
intensity in comparison to an 11 Watt T5 fluoro. Not only directly
beneath the lamp, but also at off-axis positions as well.
Click to expand...
I'm also experimenting with those strips. I have a situation with some
wall lamps with two 18W Philips fluoros and an electronic ballast in a
stainless steel enclosure with a frosted glass panel on top and bottom
(up/down lamps on the wall of a stairwell).
I have 3 of these and every one of them popped the e-ballast due to
overheating after being left on for 3-5 hours a day over a 3 moonth
period. The supplier sent out a sparky and replaced the ballasts but
they are still overheating. It's simply a very poor design since the
e-ballast is fitted inside a steel box with no ventilation and reaches
over 80C.
So I plan to strip the insides out, use a 12V SMPS where the e-ballast
was (same size), adding a few vent holes, and mount one of these LED
strip lights where the fluoro lamps were (one top, one bottom) bolted to
the internal steel enclosure. They easily put out the same amount of
light at 12V 400mA as the 18W fluoro. I took temperature measurements of
the original fitting and will write up some details about the retrofit
and re-measure the temperatures to see the difference.
 
On 16/03/2012 7:45 AM, Ian Field wrote:
"Don McKenzie"<5V@2.5A> wrote in message
news:9sf592Fuk6U1@mid.individual.net...
On 16-Mar-12 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

So 3 bulbs at Ł13 each and 27W to equal the (already substandard) light
of
an 18W CFL, I'd say they still have some way to go.

A recent issue of EPE magazine (relies almost exclusively on handed down
SC
articles) reported that Tesco had LED 'bulbs' at Ł20 each - one might
reasonably expect more lumens at that price than the offerings I found in
Sainsbury's, but I've not been there and had a look yet.

In any case, I think I'll wait for the technology to ripen a bit more for
a
while longer.

I visited this subject 12 or 18 months ago Ian, and found much the same as
you.

LEDs for general lighting are over priced, under powered, and need a lot
of development before they are in the same ball park. The colour output is
horrible for general use as well.

A friend of mine got some 12 Volt units to replace his power hungry down
lights, and found they were great for this purpose. They are running nice
and cool, compared to the little radiators he was running beforehand.

Cheers Don...

=======================

Last year I scrounged a couple of 3-bulb light fittings on freecycle, once
my flat has been refurbed so I can put them up its a chance to try out
various mixes of LED/CFL - but not before the price has fallen a fair bit
further.


Remember it's an international internet , 240v/led's for sale locally @
Click to expand...
$27.00 cost $9us direct from the distributor , it cost us about $100.00
to equip our house , still not cheap but cutting the middle sales greed
saves 60% or better

--









X-No-Archive: Yes
 
"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS ~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities. 10
off quantities, the price falls to $38.31. Better prices could likely be
found without much difficulty.
Click to expand...
At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of 11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting, they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.
 
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed 9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS ~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities. 10
off quantities, the price falls to $38.31. Better prices could likely be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of 11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting, they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.
Click to expand...
**LED efficiency (for even medium quality devices) already exceeds that
of CFLs. The drive is now to reduce costs.


--
Trevor Wilson www.rageaudio.com.au
 
"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9ss476FesvU1@mid.individual.net...
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics
than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed
9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS
~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities. 10
off quantities, the price falls to $38.31. Better prices could likely be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of 11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting, they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.


**LED efficiency (for even medium quality devices) already exceeds that of
CFLs. The drive is now to reduce costs.
Click to expand...
3x 9W 450lumen LED units to equal the light output of an 18W CFL doesn't
sound more efficient to me!

Researchers at a UK university claim to have made a huge breakthrough in LED
manufacturing technology that should slash prices - but expect a wait of 3
to 5 yrs before we see any evidence of that on supermarket shelves.
 
On 3/21/2012 8:14 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9ss476FesvU1@mid.individual.net...
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics
than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed
9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS
~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities. 10
off quantities, the price falls to $38.31. Better prices could likely be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of 11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting, they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.


**LED efficiency (for even medium quality devices) already exceeds that of
CFLs. The drive is now to reduce costs.

3x 9W 450lumen LED units to equal the light output of an 18W CFL doesn't
sound more efficient to me!
Click to expand...
**The Philips Genie 18WWWB22 is rated at 61 Lm/W.
The Cree LMH2 is rated at 80Lm/W.

Researchers at a UK university claim to have made a huge breakthrough in LED
manufacturing technology that should slash prices - but expect a wait of 3
to 5 yrs before we see any evidence of that on supermarket shelves.
Click to expand...
**I suspect it will happen a little more quickly than that. Prices have
already fallen significantly in the laast few years. We'll see.


--
Trevor Wilson www.rageaudio.com.au
 
On 3/21/2012 8:51 AM, Trevor Wilson wrote:
On 3/21/2012 8:14 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9ss476FesvU1@mid.individual.net...
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics
than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and
noticed
9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85
VRMS
~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and
cool
white) and 560 Lumen for warm white, at $42.57 in one off
quantities. 10
off quantities, the price falls to $38.31. Better prices could
likely be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of
11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting,
they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.


**LED efficiency (for even medium quality devices) already exceeds
that of
CFLs. The drive is now to reduce costs.

3x 9W 450lumen LED units to equal the light output of an 18W CFL doesn't
sound more efficient to me!

**The Philips Genie 18WWWB22 is rated at 61 Lm/W. CFL
The Cree LMH2 is rated at 80Lm/W. LED module.
Click to expand...


--
Trevor Wilson www.rageaudio.com.au
 
On Mar 21, 7:51 am, Trevor Wilson <tre...@SPAMBLOCKrageaudio.com.au>
wrote:
On 3/21/2012 8:14 AM, Ian Field wrote:









"Trevor Wilson"<tre...@SPAMBLOCKrageaudio.com.au>  wrote in message
news:9ss476FesvU1@mid.individual.net...
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<tre...@SPAMBLOCKrageaudio.com.au>   wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics
than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and noticed
9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85 VRMS
~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities.. 10
off quantities, the price falls to $38.31. Better prices could likely be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of 11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting, they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.

**LED efficiency (for even medium quality devices) already exceeds that of
CFLs. The drive is now to reduce costs.

3x 9W 450lumen LED units to equal the light output of an 18W CFL doesn't
sound more efficient to me!

**The Philips Genie 18WWWB22 is rated at 61 Lm/W.
The Cree LMH2 is rated at 80Lm/W.



Researchers at a UK university claim to have made a huge breakthrough in LED
manufacturing technology that should slash prices - but expect a wait of 3
to 5 yrs before we see any evidence of that on supermarket shelves.

**I suspect it will happen a little more quickly than that. Prices have
already fallen significantly in the laast few years. We'll see.

--
Trevor Wilsonwww.rageaudio.com.au
Click to expand...

IT will happen, look at the incredible drops in cost of every other
electronic device in the consumer market
 
"Trevor Wilson" <trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sscfaFj3rU1@mid.individual.net...
On 3/21/2012 8:14 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9ss476FesvU1@mid.individual.net...
On 3/21/2012 6:10 AM, Ian Field wrote:
"Trevor Wilson"<trevor@SPAMBLOCKrageaudio.com.au> wrote in message
news:9sfapbF94rU1@mid.individual.net...
On 3/16/2012 8:13 AM, Ian Field wrote:
OK, so I'm in the UK but CFLs get discussed more on aus.electronics
than
any
other group I use, so I'm bound to get an opinion or three.

Just happened to be wandering around the local Sainsbury's and
noticed
9W
LED 'bulbs', at 450 lumen it would take about 3 of them to equal a
typical
18W CFL.

**Probably. My local supplier has Cree 10 Watt, mains operated (85
VRMS
~
265VRMS) GU10 MR16 lamps, rated at 750 Lumen (for neutral white and
cool
white) and 560 Lumen for warm white, at $42.57 in one off quantities.
10
off quantities, the price falls to $38.31. Better prices could likely
be
found without much difficulty.

At various times over the past few years some supermarkets have special
offered CFLs at silly prices - one store even outed a few pallets of
11W
CFLs at only 10p each.

The best SO I can remember for any CFL worth buying was Morrisons did
Philips 18W at 99p - after a few days of not all that many shifting,
they
introduced a BOGOF offer at 99p.

I fear it'll be some time before LED prices get anywhere near that
ballpark - lets hope the efficiency improves a bit by then.


**LED efficiency (for even medium quality devices) already exceeds that
of
CFLs. The drive is now to reduce costs.

3x 9W 450lumen LED units to equal the light output of an 18W CFL doesn't
sound more efficient to me!

**The Philips Genie 18WWWB22 is rated at 61 Lm/W.
The Cree LMH2 is rated at 80Lm/W.


Researchers at a UK university claim to have made a huge breakthrough in
LED
manufacturing technology that should slash prices - but expect a wait of
3
to 5 yrs before we see any evidence of that on supermarket shelves.

**I suspect it will happen a little more quickly than that. Prices have
already fallen significantly in the laast few years. We'll see.
Click to expand...
I can only compare the lumen outputs of the LED & CFL lamps I found side by
side on the supermarket shelf.

Assuming they get the efficiency better than a CFL - there's always plenty
of greedy suits to carry on cashing in for a while longer!
 
On 16/03/2012 10:20 AM, swanny wrote:
On 16/03/2012 10:02 AM, Trevor Wilson wrote:

spillover and increased light available on the page. I'm experimenting
with these:

http://www.dealextreme.com/p/12w-3500k-800lm-warm-white-led-emitter-metal-strip-12-14v-80310


Very impressive. Of course, heat sinking must be arranged, along with an
appropriate current source, but the light output is both pleasing and
impressive. At 800ma @ 12 Volts, the light is almost double the
intensity in comparison to an 11 Watt T5 fluoro. Not only directly
beneath the lamp, but also at off-axis positions as well.


I'm also experimenting with those strips. I have a situation with some
wall lamps with two 18W Philips fluoros and an electronic ballast in a
stainless steel enclosure with a frosted glass panel on top and bottom
(up/down lamps on the wall of a stairwell).
I have 3 of these and every one of them popped the e-ballast due to
overheating after being left on for 3-5 hours a day over a 3 moonth
period. The supplier sent out a sparky and replaced the ballasts but
they are still overheating. It's simply a very poor design since the
e-ballast is fitted inside a steel box with no ventilation and reaches
over 80C.
So I plan to strip the insides out, use a 12V SMPS where the e-ballast
was (same size), adding a few vent holes, and mount one of these LED
strip lights where the fluoro lamps were (one top, one bottom) bolted to
the internal steel enclosure. They easily put out the same amount of
light at 12V 400mA as the 18W fluoro. I took temperature measurements of
the original fitting and will write up some details about the retrofit
and re-measure the temperatures to see the difference.
Click to expand...
A quick writeup of the tests and results here:
http://www.axtsystems.com/index.php?option=com_content&view=article&id=88%3Aradiathermal&catid=48%3Afixingstuff&Itemid=81
 
On 4/2/2012 3:31 PM, swanny wrote:
On 16/03/2012 10:20 AM, swanny wrote:
On 16/03/2012 10:02 AM, Trevor Wilson wrote:

spillover and increased light available on the page. I'm experimenting
with these:

http://www.dealextreme.com/p/12w-3500k-800lm-warm-white-led-emitter-metal-strip-12-14v-80310


Very impressive. Of course, heat sinking must be arranged, along with an
appropriate current source, but the light output is both pleasing and
impressive. At 800ma @ 12 Volts, the light is almost double the
intensity in comparison to an 11 Watt T5 fluoro. Not only directly
beneath the lamp, but also at off-axis positions as well.


I'm also experimenting with those strips. I have a situation with some
wall lamps with two 18W Philips fluoros and an electronic ballast in a
stainless steel enclosure with a frosted glass panel on top and bottom
(up/down lamps on the wall of a stairwell).
I have 3 of these and every one of them popped the e-ballast due to
overheating after being left on for 3-5 hours a day over a 3 moonth
period. The supplier sent out a sparky and replaced the ballasts but
they are still overheating. It's simply a very poor design since the
e-ballast is fitted inside a steel box with no ventilation and reaches
over 80C.
So I plan to strip the insides out, use a 12V SMPS where the e-ballast
was (same size), adding a few vent holes, and mount one of these LED
strip lights where the fluoro lamps were (one top, one bottom) bolted to
the internal steel enclosure. They easily put out the same amount of
light at 12V 400mA as the 18W fluoro. I took temperature measurements of
the original fitting and will write up some details about the retrofit
and re-measure the temperatures to see the difference.


A quick writeup of the tests and results here:
http://www.axtsystems.com/index.php?option=com_content&view=article&id=88%3Aradiathermal&catid=48%3Afixingstuff&Itemid=81
Click to expand...
**Interesting. In the sense that it is an appallingly bad design.
Excellent write-up. It will be interesting to see what transpires. I
just glued some strips to the granite under-bench in the kitchen. NO
problems all Summer.

I just tried those 100 Watt LEDs. WOW! Impressive. With no reflector, it
delivered a little more light than a 500 Watt halogen worklight (which
has a reflector). Next, I'm putting a lens on the sucker to narrow the
beam to 10 degrees.

--
Trevor Wilson www.rageaudio.com.au
 
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