LED vs Flourescent

 I was reading on the website   flashlightreviews.com which says
normally LED light output decreases by 50 percent during the first
60 minutes of operation before leveling off. The reviewer/author
states that  LED lumen efficiency takes a dive as it heats up.
The solutions to stem this performance loss (atleast with
high powered LEDs) is to install a heatsink onto hi power LEDs.


So while a 6W/280 lumen flourscent tube may not be as
energy efficient as a 3W LED or a  6W/ LED replacement
for a flourescent tube - the light output for a flourescent
tube is  more constant than its LED equavalent.



see
http://www.tradekey.com/selloffer_view/id/1681379.htm
http://www.flashlightreviews.com/reviews/maglite_mag-led.htm

 
seehttp://www.tradekey.com/selloffer_view/id/1681379.htmhttp://www.flashlightreviews.com/reviews/maglite_mag-led.htm

Never noticed a change in my LED lamps. I have thirty of them. 48 LEDs
in a MR16 package Warm White.

 

bealiba@gmail.com wrote:


seehttp://www.tradekey.com/selloffer_view/id/1681379.htmhttp://www.flashlightreviews.com/reviews/maglite_mag-led.htm

I bet his problem is with single chip high power leds.

Yes, they MUST have a heatsink, that's fundamental, or they'll also roast and
burn out too in no time at all most likely.

Arrays of LEDs such as you mention should have no trouble with convection
cooling.

Graham

 

drydem wrote:


News to me and I've been using LEDs for decades in electronics.

Were it true, I'm sure the entire electronics industry would know. Can
you cite some actual data figures from any reliable site ?

Graham

 
I'm not sure about the 60 minutes part, but the phosphors in high
intensity colors like white do weaken.