What size light fixture would be best for plant growth? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 06-15-2015, 08:32 PM Thread Starter
Algae Grower
Join Date: Apr 2015
Location: New York
Posts: 11
Question What size light fixture would be best for plant growth?

Hi, I have a 20 gallon long planted aquarium with dwarf sag and giant hairgrass. I wanted to get an LED light fixture for the simmering effect and I've found that the best option would be an evo plant LED fixture. My question is if I should get a 24" fixture for a 30" tank or a 36" ( because I don't want too much shade) I know it's a dumb question but would it matter if the fixture hangs off the sides a little? Thanks!
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post #2 of 4 (permalink) Old 06-15-2015, 08:38 PM
Planted Tank Obsessed
Join Date: Jun 2015
Location: Virginia
Posts: 324
Hanging off the sides won't help your tank much. Low light - Finnex Stingray. Medium Light (dosing, maybe co2) - Planted+ or Current Satellite. High Light, co2, dosing etc Finnex Ray2
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post #3 of 4 (permalink) Old 06-15-2015, 08:40 PM Thread Starter
Algae Grower
Join Date: Apr 2015
Location: New York
Posts: 11
True but it'd have no shimmer plus the light would still cover all of my tank like the 30" would...right?
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post #4 of 4 (permalink) Old 06-15-2015, 09:27 PM
Planted Tank Guru
Join Date: Aug 2014
Location: Maryland, USA
Posts: 2,326
I would suggest trying to get a 30" fixture that has lights all along it, if at all possible.

Having a 36" that hangs 3" off each edge isn't terrible, but not exactly attractive, and spills a lot of light into the room on either side of the tank..

a 24" fixture, with 3" of unlit tank on either end may cause the plants on the edge to "lean in" towards the light. This can be mitigated somewhat if the light is raised high above the tank and is bright enough to still put decent light intensity on the plants.

Note: the 30" Finnex Ray2 is just a 24" fixture with 3" of dead space added to each end. I do not recommend it.

New to planted tanks, avid gardener/tinkerer.
36g bow tank journal Fluval C4 + Quietflow 30, Finnex Planted+ with dimmer mod, low-tech.
10 gallon secondary tank with Finnex stingray with dimmer mod, AC20, low tech
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led, sizes

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