<a href=showthread.php?s=&postid=9062303#post9062303 target=_blank>Originally posted</a> by starmanres
Less efficient where?!?
Cost per fixture? Nope. When you take bulb replacement into consideration, it's cheaper.
Cost to run? Nope. Not even close.
Benefit to Aninals? Nope.
From the responses on this thread, PAR (Photosynthetically Active Radiation) is the key - not Lumens. As pointed out, you could line up multiple MH bulbs and increase the lumens off the scale without increasing the PAR.
Heat generation? No way.
Screw with factor? No again. You set it up and let it run for at least 60 months.
Replacement of bulbs? Undetermined. No one has been able to determine what the cost is here but the LED are about $4 each and each 12" section has 25 so about $100 per section or about what I pay for a 250w MH bulb. If no other equipment changes are needed then it is more efficent there as well.
From looking at the results, a 12" section of LED array is more efficient than a 250w MH in just about every area (life of bulb, electricity costs, PAR, etc.).
What other measurements would tip the scale in favor of MH, VHO, T-5's? Shimmer on the water?? I'm not sure that LED's wouldn't provide that as well.
Robert