weird, I have never found a T5 that puts out anywhere near at 250 watt MH, but I am doing testing through water at a distance of 18".
and yes I have tested a Tek. problem is if you are testing a 10K MH then you need to have 10K bulbs only in the T5. actinic give a false high reading pn PAR meters.
Steve
You make some very good points. When you take away all the variables, and actually compare them on fair grounds T5s just won't keep up to MH - especially when you get a bit of depth to the water.
Why do actinics give a false high reading on PAR meters?
03-30-2009, 05:27 PM
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