Newbie - Lighting Question - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-05-2014, 02:12 AM Thread Starter
Algae Grower
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Newbie - Lighting Question

I am planning to start a freshwater planted tank in a couple of months and have started purchasing the pieces I will need. I have a 46 gallon bow front tank and plan to add pressurized CO2. I found a T5 HO ZooMed light and bulbs on clearance - the bulbs are FloraSun 39W and UltraSun 39W so 78W total. I've read that I should plan on 2.5 - 3 WPG, which would require me to have 115-138 W. I've also read that HO bulbs put out more light. Will I be limited in the plants I can keep in my tank, or will this setup allow me to grow low, medium and high light plants?

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post #2 of 4 (permalink) Old 03-05-2014, 03:39 AM
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Most any plant CAN grow in light that is up from what they are rated for but not down
from that. They likely will still grow but poorly and/or with just green color if it's
normaly a red plant for example.
Three bulbs would do much better and Zoo Med has a single bulb fixture in their reptile selection and calling around to all the Petco's in driving distance may turn one up.
If you do that I'd get a Zoo Med "Ocean sun" to go/w it.

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post #3 of 4 (permalink) Old 03-05-2014, 04:42 AM
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I have to disagree with the above post. Not all plants thrive in higher light In my experience, anubis does poorly in a high light, high tech environment. If a plant can't grow more in response to high inputs, it will be unable to compete with algae and produce the necessary allelopathic chemicals to prevent algael growth on leaves.
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post #4 of 4 (permalink) Old 03-05-2014, 05:39 AM
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WPG only really applied to t12/t8 bulbs, and even with those that rule wasn't great IMO. So your t5 HO should give you sufficient lighting even at under 2wpg. Do some research regarding PAR to light your tank. I think you will find it beneficial.
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