Corals burning!

[ksicard]

Anything typically can get to much light, I'd light acclimate anything and everything.

 

[jenkins2212]

Has anyone gotten a par reading on leds?

 

[jmaneyapanda]

ksicard;859836 wrote: Anything typically can get to much light, I'd light acclimate anything and everything.

Theres two trains of thoughts for this. In terms of acclimation: yes, very true. An adjusting intensity is important. However, in terms of photosaturation and photoinhibition, clams are the exception. They cannot get too much light.

jenkins2212;859900 wrote: Has anyone gotten a par reading on leds?

That question is impossible to answer as is. I have gotten PAR reading of several types/brands, but it depends on the manufacturer, chips, optics, etc.

 

[ksicard]

Par isn't to accurate with LED's, I can't remember exactly what it was but I think the par meter has trouble reading the par of the different color led's and can be off by as much as 30-60 par. That might not be exactly accurate but I think it goes something like that.

Also as panda pointed out it all depends on the type of led's as well as optics. if you were to slap 40 degree optics on 1w led's you could get 300-400 par on the sandbed (of a shallow tank, where 40 degree otpics are made for tanks with 36inches+ of depth), it's all heavily dependant on the different setups and what not.

 

[jmaneyapanda]

ksicard;859955 wrote: Par isn't to accurate with LED's, I can't remember exactly what it was but I think the par meter has trouble reading the par of the different color led's and can be off by as much as 30-60 par. That might not be exactly accurate but I think it goes something like that.

Also as panda pointed out it all depends on the type of led's as well as optics. if you were to slap 40 degree optics on 1w led's you could get 300-400 par on the sandbed (of a shallow tank, where 40 degree otpics are made for tanks with 36inches+ of depth), it's all heavily dependant on the different setups and what not.

??? PAR is a measure of light. The source of the light is relatively inconsequential. The spectrum of liught will effect the PAR, but not because the meter is malfunctioning, because certain spectrums dont make as much PAR.

Maybe Im not understanding what youre saying.

Also, to elucidate, PAR will also vary depending on water conditions. I can take a setup, put it over one tank, measure, and move it to an identical size tank with different water, and get different numbers. The clarity and cleanliness of the water can certain make a difference.

 

[ksicard]

http://www.vividaquariums.com/aquariumLightExperiment.asp">http://www.vividaquariums.com/aquariumLightExperiment.asp</a>

Here, go to the par section of the document. I trust a company such as vivid with the statements they made.

 

[jmaneyapanda]

Excellent reference. I find it more credible being from apogee, rather than vivid. Regardless, it is interesting. However, it appears such error is only applicable if measure sole blues or reds. Not the full spectrums whites.

 

[jenkins2212]

haha good info you guys are so smart........
update: i cut whites and blues WAY back!

Edit: after reading the article i can see why par readings are irrelevant!