Can par from one light simply be added to par from another ? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 01-20-2013, 06:02 PM Thread Starter
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Can par from one light simply be added to par from another ?

Can par from one light simply be added to par from another ?

I have a fishneedit 2x t5ho unit, and I have recently purchased a Finnex Ray II. Can I simply add the 2 pars together to get an estimate ?

I have a feeling that is wrong. Other than using a par meter because I dont have access to one, how can I figure out my par rating ?
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post #2 of 2 (permalink) Old 01-20-2013, 10:12 PM
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Posted by Hoppy in another thread:

Originally Posted by Hoppy View Post
If two sources of light are close together you just add the two PAR numbers to get the total PAR. If they are not close together it is more difficult to say what the combined PAR is - if you know the PAR off the centerline, as we do with the Finnex lights, you can add the off center PAR, for the separation distance, to the center PAR, and get the total PAR.
Edit: Here is the original thread:

Adding a second light?


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