What I commonly hear from the guys running LED's is that people didn't know how to run them back when LED's first came out or you need to run them at 50% or hang them 12" off the tank or.....
LED's have been out long enough at this point that I think it's been long enough that those who adopted them should have STUNNING tanks by now.
I see only 2 benefits to running LEDS over MH and 1 over T5's. Heat and electric for the MH's and Electric for the T5's.
Damn, finally found the end of this thread!
That second paragraph has flawed logic. LED technology has been evolving at lightning speed over the past 2 years. What was state of the art one day isn't 6 months later. So, comparing the more mature lighting technologies to LEDs is like comparing apples and oranges. For example, just look at the incredible advancements Cree has made in the past 12 months.
Also, not all models of LED fixtures out there are created equal. LED performance decreases as temperature increases. So, if the fixture lacks adequate temperature control (i.e. heat sinks and fans) performance will be compromised.
I've experimented with different types and combinations of lights over the years:
- 2 x 150w DE MH combined with 2 x 130w CFLs
- 2 x 250w DE MH combined with 2 x 650w CFLs
- 2 x 250w DE MH combined with 2 x 130w CFLs
- 2 x 400w SE MH
- 2 x 400w SE MH combined with 2 x 54w T5s
- 2 x 160w Pacific Sun Python LED lamps with 3 ch colors (3w Cree XP-G and XP-E LEDs)
- 1 Pacific Sun Metis Hyperion R2 lamp with 8 ch colors 2 x 140w (3.3w Cree XM-L, XT-E and XP-E LEDs)
For a variety of reasons I am happy with and prefer LEDs. The Metis Hyperion R2 is a big improvement over the Pythons. It's smaller, more efficient, has drastically better color output and is (hopefully) more reliable than my Pythons were. I have yet to measure the lumen output for my tank set-up, but tests showed a better, broader light cast with the lamp 24" from the surface of the water as opposed to 12".
The electricity savings alone is enough to switch to LEDs. I no longer have to run a chiller (even in winter) or the AC because they transfer almost no heat to the tank. My electric bill went from an average of $400 a month to $125 for a 1 bedroom apartment. Admittedly it isn't entirely attributable to the LEDs. I'd also replaced my Mag 12 return pumps with a more efficient Waterblaster, but the LEDs represent a good deal of the savings.
So, there are a lot of variables here to take into account, and I haven't even mentioned the influence of water parameters.
Robin