02-15-2011, 01:35 PM
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From the little I've seen, I agree. Marineland claims it is 6500K, so that should do the job, although I would want to see the spectrum graph to be absolute. I may try to dig a bit more.
As for the T10, that is unusual. The "T" refers to the tube diameter, and it is in eighths of an inch, so a T8 is 8/8 or 1 inch, a T12 is 12/8 or 1.5 inch, and a T10 would be 10/8 or 1.25 inch.
The fixture should hold a T8, provided the pin arrangement on the ends is the same as the T10. Nice thing about Home Depot is you can return stuff, so you could buy a T8 Alto Daylight Deluxe by Phillips in 48-inch, try it in the fixture, and if it fits and the light is different, keep it, or return it if it is the same (or doesn't fit). I've returned tubes to my Home Depot with no questions asked, I just said the light was not what I wanted in colour. This is how I found the one mentioned.