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Old 02-12-2009, 07:45 AM   #51 (permalink)
 
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Default Re: What's the skinny on LED lighting?

EVILC66, I hope I'm not just playing semantics with your words, but adding more LED's is certainly effective at upping the PAR, it's just not a very EFFICIENT way to do it.

I haven't played with lenses/collimators on my Cree XR-E (Q5 bin) LED's, which have a "natural" slightly narrower pattern of 90 degrees. Would you bother experimenting with lenses/collimators if the starting point is 90 degrees?
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Old 02-12-2009, 02:50 PM   #52 (permalink)
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Default Re: What's the skinny on LED lighting?

I think you know I wouldn't
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Old 02-12-2009, 07:23 PM   #53 (permalink)
 
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Default Re: What's the skinny on LED lighting?

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Originally Posted by overboard View Post
The appeal of what I got was that they fit into T12 or T8 fixtures, almost as simple as changing bulbs. Some reef guys are saying these aren't high powered enough, and the data given on them isn't sufficient, and that could be quite true. They are definitely better than Coralife's CFs, though. This afternoon I tore out a bunch of 20" tall tri-leaf java ferns that had taken over my 50 gallon tank (18" tall; it wasn't working) and wow, what a difference! I was worried that the strips wouldn't cover well front-to-back, but every inch of substrate is well-lit. And I found three anubias and a piece of driftwood that I had forgotten about. A good day.
While they may work in the short term, don't expect them to last very long. 5mm don't have near the life as the HP 3w LEDs. And for $180 a bulb, change about every three years, forget it. I didn't spend that much on my LEDs, plus controller plus PWM dimmer.

BTW Evil, nice to see you here on the Fresh side (Catfishboy is my name on the dark side) And do check out my thread on AC http://www.aquariacentral.com/forums...d.php?t=165345

Oh yes, super job coley, really top notch.

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Old 02-13-2009, 06:13 AM   #54 (permalink)
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Default Re: What's the skinny on LED lighting?

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Originally Posted by andyh View Post
EVILC66, I hope I'm not just playing semantics with your words, but adding more LED's is certainly effective at upping the PAR, it's just not a very EFFICIENT way to do it.
From what I have experimented with, the change in overlap of the LEDs will bring up the PAR levels more than a single LED would put out. It's not until the emiters are right on top of each other that the levels really increase substantially. I did some work for a while with triple Rebel stars that produced some significant PAR numbers without optics. Using a lense is certainly a lot cheaper way to gain a little more performance.

Like I said before though, they aren't needed in every instance, but can be effective when used correctly.

Quote:
I haven't played with lenses/collimators on my Cree XR-E (Q5 bin) LED's, which have a "natural" slightly narrower pattern of 90 degrees. Would you bother experimenting with lenses/collimators if the starting point is 90 degrees?
Depends on what the end goal is. If I need more PAR than a bare emmiter can produce at 90 degrees I'll use one. Even if it's only an 80 degree lens, if the increase in PAR is what I need, then it's totally worth it. At only a few dollars each, it's a lot cheaper alternative in some circumstances than adding more LEDs and drivers.

Again, I'm coming from an environment where high lighting is king. I guess it's going to take me a little while to get used to the calmer side of things
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