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john f · 07/28/2006, 04:25 AM

Radiums run on the HQI ballast look identical to XM 20k run on standard ballasts, at least to my eyes.
I also think the XM may last a little longer, but I need to test that with my light meter.
The problem in testing is that light meters don't read blue very well, so I'm not sure the values given mean too much, and our eyes don't see blue too well either.

I wish someone made a light meter you could adjust, say to look for 400-500nm range only.

John

07/28/2006, 04:25 AM	#11
john f Registered Member Join Date: May 2000 Location: Gainesville, Fl USA Posts: 1,032	Radiums run on the HQI ballast look identical to XM 20k run on standard ballasts, at least to my eyes. I also think the XM may last a little longer, but I need to test that with my light meter. The problem in testing is that light meters don't read blue very well, so I'm not sure the values given mean too much, and our eyes don't see blue too well either. I wish someone made a light meter you could adjust, say to look for 400-500nm range only. John __________________ "The state is the great fiction by which everybody tries to live at the expense of everybody else." Frederick Bastiat Current Tank Info: 235 reef