beam formation?

kbone · Jul 11, 2013

For the purpose of measuring lux, is there a minimum distance from the lamp face which the sensor needs to be positioned to account for "beam formation"?

I'm looking to measure lux on headlamps mean for camping use.

AnAppleSnail · Jul 11, 2013

Yes. It depends on the beam. 1 and 10 meters (calculated back to 1m) seem common and appropriate for most lights.

kbone · Jul 12, 2013

To satisfy a nerds curiosity, could you elaborate on the physics behind this?

kbone · Jul 12, 2013

could you elaborate on the physics behind this a bit, nothing phd level, just curious as to what is occurring here.

bshanahan14rulz · Jul 12, 2013

Depending on the reflector, LED, and the positioning of the two, the beam may diverge from the front of the reflector, or it may converge a bit before diverging.

I think for a headlamp, perhaps 1m measurements would be useful too, since that is about where subjects may be illuminated with a headlamp.

beam formation?

kbone

Newly Enlightened

AnAppleSnail

Flashlight Enthusiast

kbone

Newly Enlightened

kbone

Newly Enlightened

bshanahan14rulz

Flashlight Enthusiast

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