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According to Rotalabutterfly lighting calculator, you'd be in the low 100's par with that light. Rotala Butterfly | Planted Aquarium Light Calculator

Edit: I just noticed it may be Normal Output T5 lights. If that's the case, it would be hovering at 37 par according to the calculator.
 
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Photosynthetically active radiation (PAR) refers to the amount of light that plants get in your aquarium. Therefore, the higher the PAR the more light your plants have to use, but also the more light that algae has to use. It's all a balancing act between light, fertilizers, and co2 (if you have it)

Whether your estimated value of about 37 par is good or not depends on the plants you are using. 37 par is on the lower end, but if you are growing low light plants like anubias or crypts then that par value is fine.

You can find more information about PAR here: How to read PAR tables
 
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