Quote:
Originally posted by SeanT
I am thinking of upgrading to 400 watters.
What is the biggest difference between an M-135 ballast and a HQI ballst?
I read that the HQI burns a bit brighter, but does that really justify the cost difference between the two types?
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read the very first post. it explains what a 400w HQI is. i ran a 400w radium on an M135 for a couple weeks. they look identical to a 250 radium on an electronic ballast. if a 400w radium is run on an HQI ballast, it has a whiter appearance to it. it still has a lot of blue, but more white. both M135 and SON AGRO ballasts are pulse start ballasts and contain an ignitor in the circuit. the dual PFO you mentioned is a standard M59 ballast. that's the difference in cost. if you want cheap M135's, check
www.hidirect.com hellolights will do a price match on this (i know because i did it already).