Yep, there are quite a few years worth of data at CPF but unfortunately i do not remember any of such table. For my lights i have a pretty clear idea of the figures. I use them to make comparisons to my readings, that's why i can say that my meter under-reads a bit like 7-10%. There are people who has owned multiple light meters even. I mean the work has already been done. :)
Eg the STL-V6 there are like other 3 guys having average of 45k close up distance, I get that too but i can extend to 50k at a much further distance and is very repeatable. Do we maintain that 38k should be the correct figure?
TK70, I have got like 6-7 readings ranging an average of 85-90k but bro erns get 64k and i can get purposely get it down to 60k. Obviously nobody will believe that it's 60k plus range...either that or something is wrong with the meter.
May i mention again that gcbryan has done a lux measurement thread of sorts for lights at various distances for throwers, he was trying to find out the exact mechanism at work. In my house i can only manage shorter distances like i have known 8.17m and 12.5m positions. With these 2 places i get 40k odd. I also do go to the garden to do longer distances measurements. With this i get 50k exactly. Same goes for other lights.
He's using the inverse square law (of light) to convert everything back to 1 meter. I found that for LED throwers you need to get in the 10-15 meter range. The reading settles down there as does I'm sure the focus.
For instance if you get a reading at 10 meters of 250 lux so 10 squared ( 10*10=100) so 250 lux * 100 would be 25,000 (lux) at 1 meter.
That's what he is referring to. The raw numbers don't go up with distance but when converted back to 1 meter it's more accurate than simply standing 1 meter away from the light with a light meter and measuring.
There's a certain learning curve involved with taking decent lux readings with a meter or you will get numbers all over the place.
Good timing on this thread too... I have just purchased a budget light meter from ebay and am looking forward to checking my light's lux measurements. I'm really curious what my aspheric Mag Mod can do...
