Recent content by bristle
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Worst Light You've Ever Owned
Worst light by far was the Manker E11! I have several of these and all of them failed to work with very little use!! Problem seems to be switch related which is a fairly common issue with this light apparently (based on reviews/comments elsewhere).- bristle
- Post #16
- Forum: General Flashlight Discussion
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Formula For Light Beam Angle?
I thought this would be a tough question to answer. Apparently there is a formula for calculating the "field angle" (where intensity has fallen to 10% of maximum), but I have yet to find it. There is another question also. Why does the formula α = 2arcCos ( 1 - Lm ÷ ( 2πCd )) apply to only...- bristle
- Post #2
- Forum: General Flashlight Discussion
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Formula For Light Beam Angle?
There is a formula for calculating the beam angle of lights - α = 2arcCos ( 1 - Lm ÷ ( 2πCd )) where Lm = maximum light lumens Cd = maximum light candela This formula applies ONLY for light beam angle where the beam intensity (candela) has fallen off to 50% of the maximum candela intensity...- bristle
- Thread
- Replies: 2
- Forum: General Flashlight Discussion
