02-13-2009, 06:13 AM
Join Date: Mar 2008
| | Re: What's the skinny on LED lighting?
Originally Posted by andyh
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.
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