I want to upgrade the lighting on my 29 gallon from a 2x24W T5HO fixture. I mainly dislike having dark ends of the tank where the 24" fixture is shorter than my 30" tank.
I have taken my inspiration from one of Hoppy's builds. I plan on using 2 2" wide aluminum channeling to house 7 cool white CREE XP-G's, for a total of 14 LED's. I had intitally planned on using 65 degree optics, but I only want to suspend the fixture 6-12" above the water surface. In talking with Rockhoe14er, I have come to realize the optics might be unnecessary. LED's will be spaced 4" apart, and the two rows will also be 4" apart. This will allow for the most even lighting on the 30"X12" tank without using 20+ LED's. I will be using a dimmable Mean Well driver to achieve the PAR I desire (80-100 at the substrate).
Is there anything I am missing? Any suggestions?
I am a total newbie when it comes to electronics, so thanks to speedoflife (local TPT member) and Rockhoe14er for your help so far.
Don't mean to sound arrogant, but it's not really worth doing that rendering. I can if you really want it, but you can easily see from this picture (stolen from www.ledgroupbuy.com ) that it essentially spreads the light everywhere. However, this is misleading, as one can see by the intensity vs angle graph on the LED's data sheet how much more intense it'd be at the center. I suppose one could do a sort of rendering combined with the intensity vs angle incorporated, but I'm not that smart.
I highly recommend you run optics, you want to reduce the amount of light hitting the glass as much as possible. I didn't on my fixture and oh my goodness the algae that grows on the glass is ridiculous, if I don't scrape the glass, it only takes 2 days before I can't even see into the tank anymore.
I'm redoing my fixture right now, adding 60degree optics and dimmable drivers. Wish I did this from the start!
I think I would use 40 degree optics, to get more PAR at the substrate, to reduce the light striking the glass, and to enhance the "shimmer" effect, if you want that. And, I would put the light a foot above the tank, because it looks good there, and it gives you good access to the tank for maintenance.