What LED colour is most visible?

P

Peter

Guest
I'm making a kind of super solar powered garden light for a harmless
stunt.I'm wondering what colour LED I should pick out of several
available colours in high intensity LEDs. I'm looking for greatest
visibility at a distance at night.
A bit of reading in other places suggests that yellow or green is the
answer. Before I go ahead and buy some LEDs, what do readers here think?

PH
 
Peter wrote:
I'm making a kind of super solar powered garden light for a harmless
stunt.I'm wondering what colour LED I should pick out of several
available colours in high intensity LEDs. I'm looking for greatest
visibility at a distance at night.
Click to expand...

** You want the garden to be visible, or the LEDs?


A bit of reading in other places suggests that yellow or green is the
answer.
Click to expand...

** The brightest LEDs by far are white.

So best in both above cases.


..... Phil
 
On 6/09/2016 9:51 AM, Peter wrote:
I'm making a kind of super solar powered garden light for a harmless
stunt.I'm wondering what colour LED I should pick out of several
available colours in high intensity LEDs. I'm looking for greatest
visibility at a distance at night.
A bit of reading in other places suggests that yellow or green is the
answer. Before I go ahead and buy some LEDs, what do readers here think?

PH
Click to expand...

**The answer is somewhat complicated. The human eye is most sensitive to
green range of colours (by a considerable margin). LEDs are not
necessarily the most efficient at green however. You need to balance LED
efficiency at a specific colour temperature vs. the eye's sensitivity.
Additionally, the angle of light needs to be taken into account. Your
answer will lie within those figures. Green lasers appear MUCH brighter
than red ones, despite similar power levels. Interestingly enough, solid
state green lasers (not LEDs) are created by frequency doubling a near
infra-red or infra-red laser, because solid state lasers can be more
easily made to operate in the red end of the spectrum.


--
Trevor Wilson
www.rageaudio.com.au
 
On 2016-09-05, Peter <noemail@pigpond.com> wrote:
I'm making a kind of super solar powered garden light for a harmless
stunt.I'm wondering what colour LED I should pick out of several
available colours in high intensity LEDs. I'm looking for greatest
visibility at a distance at night.
A bit of reading in other places suggests that yellow or green is the
answer. Before I go ahead and buy some LEDs, what do readers here think?
Click to expand...

Green is highest visible intensity per watt in (if you buy the right
one), so if your power supply is constrained, green will probably work
best.

Lenses will effect the visibility if a concentrated beam will work in
your application get a tight angle LED or use an external lens (eg: cheap
magnifier) to concentrate the beam

--
This email has not been checked by half-arsed antivirus software
 
On 6 Sep 2016 06:17:39 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:
--
This email has not been checked by half-arsed antivirus software
Click to expand...

Love it :)
 
"Phil Allison" <pallison49@gmail.com> wrote in message
news:aaae4357-4eba-4917-a6b4-7fb841176bcf@googlegroups.com...
Peter wrote:

I'm making a kind of super solar powered garden light for a harmless
stunt.I'm wondering what colour LED I should pick out of several
available colours in high intensity LEDs. I'm looking for greatest
visibility at a distance at night.


** You want the garden to be visible, or the LEDs?


A bit of reading in other places suggests that yellow or green is the
answer.


** The brightest LEDs by far are white.
Click to expand...

Did they make the jump from blue LEDs with yellow phosphor, to UV LEDs with
white phosphor?

Someone told me the UV/white was more efficient.

As an opportunist purchaser who buys what's cheap - the LEDs I buy have a
yellow fringe around the beam pattern.
 
Benderthe.evilrobot wrote:
"Phil Allison"

** The brightest LEDs by far are white.

Did they make the jump from blue LEDs with yellow phosphor, to UV LEDs with
white phosphor?
Click to expand...

** Near UV pumped white LEDs exist, but do not ask me where to buy them.


Someone told me the UV/white was more efficient.
Click to expand...

** Not more efficient, but have a better colour rendering index.

Concerns are held about the UV output.

Good for special applications maybe.


..... Phil
 
On Fri, 23 Sep 2016 01:10:46 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

Benderthe.evilrobot wrote:

"Phil Allison"

The brightest LEDs by far are white.

Did they make the jump from blue LEDs with yellow phosphor, to UV LEDs with
white phosphor?


Near UV pumped white LEDs exist, but do not ask me where to buy them.


Someone told me the UV/white was more efficient.


Not more efficient, but have a better colour rendering index.

Concerns are held about the UV output.

Good for special applications maybe.
Click to expand...

Bug zappers.

>.... Phil

--
I call shenanigans on all theistic religions
 
On 17/12/2016 9:48 AM, Lucifer Morningstar wrote:
On Fri, 23 Sep 2016 01:10:46 -0700 (PDT), Phil Allison
pallison49@gmail.com> wrote:

Benderthe.evilrobot wrote:

"Phil Allison"

The brightest LEDs by far are white.

Did they make the jump from blue LEDs with yellow phosphor, to UV LEDs with
white phosphor?


Near UV pumped white LEDs exist, but do not ask me where to buy them.


Someone told me the UV/white was more efficient.


Not more efficient, but have a better colour rendering index.

Concerns are held about the UV output.

Good for special applications maybe.

Bug zappers.
Click to expand...

**And some Luxman turntables (they used a cold cathode UV tube, that
illuminates the strobe disk under the platter, which wears out). It
looks very cool, BTW.



--
Trevor Wilson
www.rageaudio.com.au

---
This email has been checked for viruses by Avast antivirus software.
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As far as led's are concerned the three primary colours are the brightest. And of the three they will all look different eye sensitive.
Should you want true colour and a good white you will have to have the three balanced. I would suggest looking up online the subject of ilda rgb lights on serch engine. They will give values for the three colours with led's up 100 watt.
 
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