Quote:
Originally Posted by dabandit
how is it more efficient to run a 70w over a 35w?
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Not sure I follow, is that something I said or someone else?
Efficiency can be interpolated many different ways but in the hobby I believe we tend to use PAR compared to actual measured power used. So a 10K would be more efficient than a 20K of the same wattage. So a 70W MH could be more efficient than a 35W Xenon or different lighting source, but it all depends on the PAR rating for Xenon and of course bulbs and ballasts used.