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The article was specific about the conditions under which "droop" occurred,They should have said droop because of temperature rise.
You need proper design.
Its not mysterious.
The small leds as shown in the article are easy to overdrive
and get very fast droop, and then permanent droop.
They even change color as they start to burn up.
The specs don't usually say lm/watt
they give lumens at some wattage, usually 1.
If you decrease current, you get more lm/watt of course.
Well I wonder why a lot of city and county road departments switchingOn 9/30/2009 6:50 AM Meat Plow spake thus:
I see LED lighting being the next generation in home lighting and CFL
not lasting except in legacy application.
Maybe not: check out this article (this was posted in some newsgroup I
read or other, not sure if it was here):
http://www.spectrum.ieee.org/semiconductors/optoelectronics/the-leds-dark-secret
The LED's Dark Secret
Solid-state lighting won't supplant the lightbulb until it can
overcome the mysterious malady known as "droop"
I have a set of LED stage lights consisting of reg green and blueThey should have said droop because of temperature rise.
You need proper design.
Its not mysterious.
The small leds as shown in the article are easy to overdrive
and get very fast droop, and then permanent droop.
They even change color as they start to burn up.
The specs don't usually say lm/watt
they give lumens at some wattage, usually 1.
If you decrease current, you get more lm/watt of course.
The article was specific about the conditions under which "droop" occurred,
and the fact that the cause is not understood.
This is interesting, because LEDs (red ones, at least) are generally more
efficient when pulsed at high currents.
Because they're not using blue LEDs.I wonder why a lot of city and county road departments switching
to LED or installing new LED didn't hear about "the droop"?
Sadly I want decent quality light in my home. And no LED I've found yetI wonder why a lot of city and county road departments switching
to LED or installing new LED didn't hear about "the droop"?
Because they're not using blue LEDs.
Regardless, LEDs last much longer than incandescent lamps, and are
substantially more efficient, "droop" or not. So they come out ahead.
No, not yet. Give 'em time.Sadly, I want decent quality light in my home. And no LED I've found yet
gives this. They can't seem to give a true daylight which would be fine
for some purposes -- or a reasonable imitation of tungsten for that "warm"
lighting when required.
I don't know. The $2 CFLs I get at Home Despot are terrific. The basicGood quality fluorescent can, though -- but the choice of CFLs is too
limited at the moment to compete well with that.
They've actually had quite a lot. Bit like batteries for cars - we'reSadly, I want decent quality light in my home. And no LED I've found
yet gives this. They can't seem to give a true daylight which would be
fine for some purposes -- or a reasonable imitation of tungsten for
that "warm" lighting when required.
No, not yet. Give 'em time.
It's not so much the perceived colour, but more what its light does toGood quality fluorescent can, though -- but the choice of CFLs is too
limited at the moment to compete well with that.
I don't know. The $2 CFLs I get at Home Despot are terrific. The basic
balance is on the warm side, with no hint of blue or green. Though
spec'd at 10K hours, they last about 2K. Which makes the purchase price
no different than incandescent lamps.
There is a vast range of fluorescents available - although not in all tubeOne way to get "warm" light is to use an appropriate shade. Three of
mine are mounted in Ikea glass "bullet" hanging fixtures, the fourth in
Ikea's cheap floor lamp. These shades add warmth. I also have two,
without shades, in the bath, on the "light bar" over the sink. Their
unfiltered light is, to my eyes, close to neutral, and definitely more
pleasing the color of "warm" conventional fluorescents in my kitchen.
;-) At the moment I only use them for outdoor lighting and cupboards. TheDid I mention that they come on at more-than-useful brightness instantly,
and come to full brightness in about 30 seconds?
I don't know what everyone is complaining about. You can get really good,
cheap CFLs right now.
What more do you want?
I hope I don't sound unduly sarcastic when I ask... You're /that/ botheredI don't know. The $2 CFLs I get at Home Despot are terrific.
The basic balance is on the warm side, with no hint of blue
or green. Though spec'd at 10K hours, they last about 2K.
Which makes the purchase price no different than
incandescent lamps.
It's not so much the perceived colour, but more what its light
does to other colours like paint etc. Due to the spectrum being
non-continuous or spikey. Of course tungsten alters colours,
too, compared to daylight but in a more subtle way.
No - only if a colour I like changes into one I don't under artificialIt's not so much the perceived colour, but more what its light
does to other colours like paint etc. Due to the spectrum being
non-continuous or spikey. Of course tungsten alters colours,
too, compared to daylight but in a more subtle way.
I hope I don't sound unduly sarcastic when I ask... You're /that/
bothered by metamerism?