<a href=showthread.php?s=&postid=14390973#post14390973 target=_blank>Originally posted</a> by daveonbass
Hey Grim, or anyone that would know.
I finally have the money for the ATI PM, but now the SP is out. Is the PM still the better of the two ATI fistures? I keep hearing that it is still the flagship of the ATI company, But does anyone have any proven comparisons.
A lot of the differences in these fixtures is about the fans; more of them in the PM, and of much better qualityâ€"as in metal construction. The SunPower has half the amount of fans that the PM has, and they are plastic. I can't confirm this, but I have also heard that the plastic fans in the SunPower are also smaller...
A lot of what it comes down to is how much you believe active cooling benefits T5 output. For many people cost wins out over PAR, and the TEK still sells well with NO active cooling (though many DIY). But if you really do believe in the benefits of active cooling, the PM does it better than anything out there currently. The SunPower it seems, falls somewhere in the middle...
As a PM owner who has measured the operating temps of both the T5's cold spot, and the middle of the bulb, with a laser gun thermometer, I can tell you that the more plentiful active cooling in the PM, at the higher voltage settings on the fan's converter controller, really makes a BIG difference...
And what I can tell you is that you have to turn the fan voltage converter controller for the PM (with double the fans of the SunPower) up to 9 volts to get the T5's at optimal temperature (ATI recommends 4.5 volts). 12 volts, the highest setting, works too, but it makes the fans VERY audible and what most would consider as too loud. I can't see how with half as many fans, the SunPower would be able to cool the bulbs to optimal temperatures, but then again, don't forget that many have had great success with T5's with less than optimal cooling and less than optimal bulb temperatures...
Like so many things in the hobby, the SunPower versus Powermodule decision is really about
your interpretation of the importance of active cooling on T5's, and how much you are willing to pay for it...