Wow look at that! Great work Mr Hemp Seed!
I have been churning about this for a while. I am curious about how you obtained your values. Did you use a light meter or a camera? Your values are just a little off from my unorganized estimations. I have been playing with my light meter and measuring output of my lights and comparing it to the sun. In order to get EV 14 (F16/ASA100/60th of a second facing the north sky on a sunny day) I had to put my light meter only two inches away from my 175 watt metal halide. I was very discouraged and it caused me to get a new bulb for my 1000 watt setup. After using my light meter to measure the output of the 1000watt agrosun, I was able to obtain EV 14 at 32" from the bulb and about EV13.5 all the way out to about 40" from bulb. This is proof enough for me that the diffrence between the 1000 watt lights and all others are staggering.
On a side note, my understanding was that EV 14 was the light produced by the noon day sun. I look at your chart and it seems you have the noon day sun a little higher. Is this due to your tropical location? I tested the meter on a textbook noon day sun and got only EV 14. Mabe a little more if I pointed the meter sensor right at the sun! Your lumens info is a very nice touch. I think I will go back and study your excellent work! |