Quote:
Originally Posted by StirCrazy
hey welcome back, not much has changed, you still want MH for the best lighting, T5 HO (is no T5VHO) has replaced VHO and PC. (about 50% more output than a PC)
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I know you like to say this but what is it based on? Your measurements of a Tek fixture in Safari way back when? For reference, I measured the PAR of my 6x24W ATI Sunpower fixture with 8 month old lamps in a 24x24x20 tank and found the following measurements:
At the surface: ~ 600-700 μmol m-2 s-1
Mid tank: ~ 400 μmol m-2 s-1
Bottom of the tank: ~ 200 μmol m-2 s-1
Please tell me how that supports the contention that "you still want MH for the
best lighting" and the statement, "50% more output than a PC". From what I've seen of reported PAR values in numerous tanks, there are a lot of MH setups that would have a difficult time getting a PAR reading of 200 μmol m-2 s-1 20" below the surface (the old lamps notwithstanding). Also keep in mind these are values with fewer than 150W of light and mind the fact that shorter T5 lamps are known to produce considerably less PAR than longer lamps.