| Hmmm. A lux is the light that falls onto a surface placed at 1m from a single candle, so to measure a torch in lux one would have to specify the conditions or else it is meaningless.
However, equally, to specify in lumen on would need to know the cone geometry.
For any comparison 1000 lumens, concentrated so that it shone onto exactly 1 m2 would light up that square metre with an intensity of 1000 lux. |