Requirements for Low light lightning - The Planted Tank Forum
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post #1 of 5 (permalink) Old 07-04-2017, 04:31 PM Thread Starter
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Requirements for Low light lightning

I'm setting up a low tech 15 gallon, I've been told the watt per gallon rule is outdated and inaccurate, how many watts is needed then for my 15 gallon?

Also, would anyone recommend me this LED light as a low light?
https://www.amazon.com/dp/B0191EWII2..._t2_B06XKQM83C
"Kelvin: approx.7500K
Lumen: approx.380lm"

Also would any fluorescent T5 strip bulb do the job or it must be specifically designed as "Day light"?
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post #2 of 5 (permalink) Old 07-04-2017, 07:43 PM
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Watts per gallon being outdated means that you no longer measure light in watts at all (except for maybe a very vague idea of what you're looking for). Check out this thread: https://www.plantedtank.net/forums/10...ead-watts.html.

More info on LEDs can be found here: https://www.plantedtank.net/forums/10...ompendium.html

EDIT: That was terrible wording lmao, of course people still measure light in watts, just it's not very useful in determining what lighting you need for your aquarium is all I meant!

Last edited by geisterwald; 07-04-2017 at 08:35 PM. Reason: bad wording
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post #3 of 5 (permalink) Old 07-04-2017, 09:29 PM Thread Starter
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Quote:
Originally Posted by geisterwald View Post
Watts per gallon being outdated means that you no longer measure light in watts at all (except for maybe a very vague idea of what you're looking for). Check out this thread: https://www.plantedtank.net/forums/10...ead-watts.html.

More info on LEDs can be found here: https://www.plantedtank.net/forums/10...ompendium.html

EDIT: That was terrible wording lmao, of course people still measure light in watts, just it's not very useful in determining what lighting you need for your aquarium is all I meant!
This made me more confused lol. Also, par values are rarely available.
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post #4 of 5 (permalink) Old 07-04-2017, 10:53 PM
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Quote:
Originally Posted by FlintMint View Post
This made me more confused lol. Also, par values are rarely available.
It's in the article but you want 30 micromoles of PAR at depth (water depth not including substrate) for the line between Low and Medium light. You are right that it can be tough at times to find the stats for this or that light but there are some resources like the ones from @geisterwald. I added this link to the bottom of the LED light thread but just in case you didn't see it here is a good spreadsheet with PAR values for different depths and offsets for a lot of popular lights (check the results tab and mind the scroll bars):

https://onedrive.live.com/view.aspx?...PbzLR0iQr081e4
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post #5 of 5 (permalink) Old 07-04-2017, 11:00 PM
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If you have a local aquarium society (or a good planted aquarium shop etc) you can also sometimes find someone with a PAR meter you can borrow.
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light for plants, low lighting, low tech, nano light

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