Led Par testing
- Thread starter mojoreef
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1guydude
Well-known member
+1 in time these lights will only get better me thinks! Thxs again mike for bring the par meter and talkin about tanks!
Only thing i would recommend for DIYers or just buyers is that u want more leds and less optics.....say 40 leds with 40deg optics over 20 leds with 60 or 80deg optics!
Only thing i would recommend for DIYers or just buyers is that u want more leds and less optics.....say 40 leds with 40deg optics over 20 leds with 60 or 80deg optics!
Myteemouse
NOTHING
Aquanaut
I Love Big Torts!
What no one has mentioned yet is what is acceptable coral growing PAR needed at the bottom most level and the excessive level exposure at the uppermost reef level that is harmful to SPS. Durring SEAMAX a vendor was stating that their newest 100w cree flood light needed 36" ABOVE the tank! because of its intensity.
10gnano
Well-known member
What percent do you have your lights at?
Well we werent really going into that Aquanaut, but I guess what most folks look for, for say SPS is around 300-400, LPS is around 200-300 and softies around 150- 200. But thats a subjective thing and varies from species to species, also coral can adapt to lower levels by adding or deleting zoox. Also it seems that LEDs tend to push most of their photons in a narrow band in terms of spectral output and that I believe has a huge impact when you are looking at these.
Myteemouse thats a strange one, I believe those were the same leds that Seth is using and if so we could not get those numbers??
Mojo
What would be nice to see is a series of PAR contour-plots for a couple of different distances below the fixture. Like Sanjay did with MH reflectors years ago.
I would be very interested in seeing eveness and spread for some of these setups.
I would be very interested in seeing eveness and spread for some of these setups.
Thanks!
Some of those LED fixtures sure drop off quickly if you aren't directly under the center. This suggests that there is almost no reflector effect sending light straight down.
It would be interesting to see similar contour plots with PAR measured 6" and 12" (and perhaps more) below the water surface to take into account the index of refraction (reflection) effect at the water surface from light hitting it at that much of an angle.
Some of those LED fixtures sure drop off quickly if you aren't directly under the center. This suggests that there is almost no reflector effect sending light straight down.
It would be interesting to see similar contour plots with PAR measured 6" and 12" (and perhaps more) below the water surface to take into account the index of refraction (reflection) effect at the water surface from light hitting it at that much of an angle.
Dan the drop offs were even worse under water, or at least on the units we looked at. Again the grind on the lens, Seth said that his were 70 degrees on the outside and that showed up on the testing. Going to do some more testing this weekend, so i will try to be a little more detailed on the results, one of the lights is going to be with out lens so we will see how that pans out.
Mojo
Mojo
Not a surprise. Looking forward to the additional measurements.
