# Lumens per gallon

#### tony

##### Active Member
Member
What amount of lumens per gallon is considered low, medium, and high?

#### mathas

##### Well Known
Member
tony said:
What amount of lumens per gallon is considered low, medium, and high?
I'm not sure you're going to find a good answer to this question. If I had to throw out some arbitrary and general numbers, I'd say something within these ranges might be appropriate:

Low: 0-150
Medium: 150-300
High: 300+

That said, lumens aren't necessarily the best metric by which to measure light.

OP
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#### tony

##### Active Member
Member
Ok. Well feel free to school me on what would be the best way to measure it lol Aquarium lighting confuses me more than anything else regarding my aquarium.

#### mathas

##### Well Known
Member
tony said:
Ok. Well feel free to school me on what would be the best way to measure it
I don't know that there is a "best way" to measure lighting. Photosynthetically Active Radiation (PAR) probably gives you the best feel for how much usable light you have, but in truth, the entire subject is too complex to rely on any one variable to tell the entire story.

There are two main problems with using PAR as your guideline:

1. The PAR value is almost exclusively useful as a comparative measurement, rather than an absolute. If you have a PAR reading of 1000mol, that probably means nothing to you or to the vast majority of people. If, however, you use PAR readings to compare two fixtures, you can easily tell which one produces more useful light.
2. A decent PAR meter is likely to cost upwards of \$200+, which is more than most people are willing to spend

tony said:
Aquarium lighting confuses me more than anything else regarding my aquarium.
It's among the most complicated topics in the hobby, in my opinion, so that's not surprising. It confuses just about everyone at times.

OP
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#### tony

##### Active Member
Member
Well thanks for your help. I'm glad I'm not the only one confused