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Soundwave · 03/14/2009, 08:48 AM

The P4 would work but they just aren't as bright. The lumen output according to cree is only 87.4 max at 350mA. The Q4 is 107. The Q5, their highest, runs at 114.

This is all at 350mA. They can handle up to 1000mA and the lumen output increases with the amperage.

As far as spacing, it's something close to 2 inches. I have to paint the thing today so I'll measure for sure.

Tank size is 48x18x21

As far as placement, the whole thing is 48 inches. 12 inches in from each end is the center of the heatsinks. that leaves 6 inches from each end to the beginning of the heatsink with a 12 inch gap between the two.

Hope that helped.

03/14/2009, 08:48 AM	#292
Soundwave Registered Member Join Date: Mar 2008 Location: Maroa, Il Posts: 361	The P4 would work but they just aren't as bright. The lumen output according to cree is only 87.4 max at 350mA. The Q4 is 107. The Q5, their highest, runs at 114. This is all at 350mA. They can handle up to 1000mA and the lumen output increases with the amperage. As far as spacing, it's something close to 2 inches. I have to paint the thing today so I'll measure for sure. Tank size is 48x18x21 As far as placement, the whole thing is 48 inches. 12 inches in from each end is the center of the heatsinks. that leaves 6 inches from each end to the beginning of the heatsink with a 12 inch gap between the two. Hope that helped.