Engineering an LED lamp

[jawnn]

I am trying to under stand if I will get enough light from these LED towers
WLED-WHP13-T http://superbrightleds.com/specs/bulb_specsHP360.htm

I used this calculator http://led.linear1.org/lumen.wiz and discovered that the tighter the beam the less lumens.....well that can't be for refecting... CAN IT????

I am going to install 2 of these LED towers in one fog light with aprox. 100 degree reflective angle. I am thinking I may have to use three.....

 

[yellow]

dunno what this converter makes,
but lumen stays the same, candlepower gets higher with tighter beam

Nothing against Your idea, but its not worth doing:
* fog light (=automotive) is built much too rugged (read: heavy) to be of any use
* these "towers" have no chance against a good actual single powerled with good focusing, and a quad-emitter will kill them
* even when they would be run on a power they might be near a single emitter led in output --> heatsinking is nonexistent, they will degrade fast

get a cheapo P7/MC-E light form kaidomain or Dealextreme, one that has an input voltage like Your batteries will have,.
Use just the head of this light, add an end plate with switch, connections to battery and inside contacts and mount the whole thing on Your bars.
Much better off + cheaper + less work.

 

[jawnn]

can any one tell me abou this? why is it so bright?

Endor Rebel - Cool White, Tri-Emitter, 540 Lumens @ 700mA


on this page http://www.luxeonstar.com/luxeon-leds-by-lumens-425-to-790-lumens-c-66_79.php

is ther an web page about engineering LED lights?

 

[Benson]

I am trying to under stand if I will get enough light from these LED towers
WLED-WHP13-T http://superbrightleds.com/specs/bulb_specsHP360.htm

I used this calculator http://led.linear1.org/lumen.wiz and discovered that the tighter the beam the less lumens.....well that can't be for refecting... CAN IT????

No, it's not for "refecting". It's for converting beam angle and mean intensity over a cone of specified angle into lumens, so you don't have to get radiation plots and do numerical integration. I have a feeling you're greatly misapplying it.

The page with the LED towers doesn't have adequate information to determine total output. (Possibly because it would result in great embarassment...) However, given that the one you mentioned only draws 0.42W total, it doesn't seem hard to guess that the output will be significantly less than 50 lumens.

As to why that star is "so bright", it's because it has 3 emitters capable of 180lm each. The result is 540lm, but is nearly impossible to focus. Kind of like your plan for throwing 2 or 3 3-high "LED towers" in a fog light designed for a single filament source, except this might actually have enough output to be useful without focusing. If you have any intention of using that sort of output, I'd recommend an MC-E or P7 instead, with appropriate reflector or optics.