Quote Originally Posted by RackitMan
The inverse square law applies to an omnidirectional (360 degrees) light source. LEDs have a much narrower light dispersion (15 to 120 degrees). The lumen drop-off is dependent on the viewing angle.
This is true Rackitman.

You seem to be one of the few that actually understand the physics of this.
Aloha brother!
Good to meet you.

Aloha, M. P.
I'd say that your 1/3 the light for twice the distance says the Procyon has 120 degree lensing, no?
Good to know! :thumbsup:

Got similar results from a UFO.
And a lensed 5W emitter array had less "drop-off" per distance than the UFO had.
I have 60 degree lenses glued on them and, allowing for some loss to the interface, they come close to 2X the distance 1/2 the light.
180 degree emitters do run pretty close to Inverse square law though.
My Ledengin emitters are 180 degree and measure within 10% of what the ISL says it should.
Tried lensing them but the lenses trap too much heat.
Now hunting for tiny plastic parabolic reflectors to attach to the red leds.
(I already have a surplus of blue light and want the wide angle on the blue emitters)
Anybody know a source offhand?

'nuff jackin' around.

Weeze