Yea,im pretty sure im already starting to see the difference with the HPS vs. the CFL's.When i had both 42 watters running it only made 5400 lummens.And that was usually the most i could run to stay with in the temp range.Only some times i could run an extra 23 watter.And still that would only bring it to like 5900 - 6000 lummes @85F or more

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Now with the HPS it easily makes 6800 lummes @ 77-79F

.Plus i dont have to keep the plants an inch away anymore.So i dont have to adjust the ligths at all now

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HPS's are def sweet.And mine only cost $79.99 at home depot.All i had to do was take the light bezel off,and separate the socket from the ballast and remove the reflector to extend the socket wires.I also had to wire my own plug,cuz the light was intended to be hard wired.