I thought i signed up a few years ago but couldn’t sign in. Yes VOB’s video was great and he is a great guy also. This light looks like a lot of fun. Thanks guys for another flashlight forum. …Robert
quote from vob….I got 1,176,000 at 10m and the 1,229,000 at 15m
those are your corrected numbers, not the ones you actually read at those distances correct ?
Candela by definition is lux at one meter.
If you say 1176000cd at 10m that means the lux mas measured at 10m and then the candela was calculated based on that.
You cannot have 1176000 candela at 10 meters, that doesn’t make any sense. That would be saying “lux at 10m at 10m”.
And yes for a highly collimated light you need to measure at a longer distance to get accurate cd values, which is why it is higher at 15m than 10m.
I usually use 5M for smaller lights, since you use the distance, squared, then you’re multiplying the meter reading by 25. To calculate distance you would then multiply that result by 4 and take the square root. So, if you measured 7,800 lux at 10 meters you would multiply 7800 x 100 for 780Kcd, 780,000 x 4 = 3,120,000. The square root of 3,120,000 is 1766.35 so your TN42 would throw 1766.35M by calculation. (which is 1.098 miles)
Edit: For the record, when we say 780Kcd the K means thousand, 780 thousand candela. So when Matt got 1290Kcd it’s really expressed as 1.29Mcd. The M being Million. A new realm, right?