Re: CFL bulbs -- how bright for how long.

In article <vBLcl.113137$ln7.27651@xxxxxxxxxxxx>, Percival P. Cassidy wrote:
On 01/18/09 09:44 am JohnR66 wrote:

I have just bought some "Lights of America" brand 45-watt-equivalent LED
bulbs (power consumption only 3.5W) intended for use in accent lights: a
nice white light and no warm-up delay.

Lights of America products are typically poorly engineered junk. Also beware
of cheap LED lights. They will fade within a few hundred hours of use. These
are the type made from clusters of those 5mm indicatoer style LEDs. The
bulbs are usually under $25. The only good LED bulbs are expensive and use
high power LEDs, like the Cree XR-E emitter.

That 2005 supplement shows Lights of America CFLs outlasting Sylvania.

My experience with Lights of America (though mostly not buying much from
them since 2002 due to disappointments) is early failure.

Why should small LEDs fade significantly in this configuration if they
don't fade as indicator lights?

White low power LEDs have low usage as indicator lights, and they are
likely to run into fading issues there unless seriously underpowered.
Keep in mind that most modern white LEDs are plenty bright enough for
use as indicator lights at 3-4 milliamps, 15-20% of the 20 milliamps that
most "low power" LEDs have their specified performance dependent on. Keep
in mind how glaringly bright most modern white low power LEDs are at 20 mA
- they will put spots in your eyes!

- Don Klipstein (don@xxxxxxxxx)
.

Relevant Pages

  • Grow-Tron, For Sale!
    ... Uses less power than two 100W incandescent bulbs with the ... The idea here is still to fit the lights into the tank. ... So I'm thinking some hundreds of LEDs would go into the tank. ... Reds again should be all over. ...
    (rec.gardens)
  • Re: Glider Lighting
    ... a certified glider, ... Adding lights is a major alteration. ... LEDs are very bright, but also very directional. ... and the power supplies to go with them. ...
    (rec.aviation.soaring)
  • Re: Spiderman - LED hard lighting pics
    ... it..I like when he lights up and you see his real colors. ... put the green flashers in though...I think that would be cool. ... Remember these are warrantied bulbs and patented on the 5LED circuit ... design to protect the LEDs from overvoltage problems. ...
    (rec.games.pinball)
  • Re: White LED Flashlight vs. Halogen
    ... >much lower power consumption than filament bulbs. ... >comparing the two light sources? ... LEDs are "efficient" ...
    (sci.physics)
  • Re: White LED Flashlight vs. Halogen
    ... >much lower power consumption than filament bulbs. ... >comparing the two light sources? ... LEDs are "efficient" ...
    (sci.optics)