![]() IMPERIAL CALCULATORS (reflector dimensions are in inches): METRIC CALCULATORS (reflector dimensions are in mm): Using these calculators for an LED with a dome will yield inaccurate results. NOTE the lumen calculations are based on the lambertian emission pattern of a FLAT or DEDOMED led. These values can be set by adjusting the sliders or by clicking the number and typing in your value. The arms are what hold the center light source in place. number and thickness of arms (for recoil reflector only):įor example, this light here has 3 “arms”: dimensions and focal length of the lens/reflector led die diameter (if square, multiply by 1.41 (root 2)) lumens in spill (for standard reflectors only) Using these equations, it is possible to find: These are some advanced calculators I have made to help me estimate the final performance of the custom flashlights I build, and I decided to share it with you guys so you can do the same ![]()
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