I've got my cheapy lux meter

LED Flashlights – General Info
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Came in the mail today. It took a bit of head scratching but I think I’ve got the formula - kcd = lux * distance(squared) and the further out the distance the more accurate the result. I have left my tape measure and laser measurer at work so I also found out the distance needs to be relatively accurate as well.

I did some testing on the lights I have. Some figures seem about what I was expecting some are a bit lower than I was expecting but I’m not going to trust the results until I get used to this thing and how to use properly.

So my main reason for posting is what are the do’s and don’ts ?? How can I get the best out of this thing? Can I recalibrate it since the instructions say “periodic recalibration”?

Thanks in advance, school me H)

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I had both inexpensive (sub $300) and cheap lux meters (DX) and seen some $18K expensive ones capture lux on some throw lights of years past.

I always measure at 5M and calculate back to 1M. This works good for 50K lux~150k lux lights. If you have a lot more throw lights I would suggest measuring at 10M.

I found the DX lux meters to be just as accurate. The more expensive ones have a deviation of up to 3, so if your DX ones are 5 or so, its still ok for what we use them for.

I use mine to test Lux on stock lights, than as I mod the light I check the improvements. Using the same lux meter with topped off cell and try to replicate the conditions as best as possible.

bigC