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What's the best 4 foot light specs?

Bamf Comics

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Crewe VA 23930

I just purchased that one a couple weeks ago. 3200 lumens and 5000K for under $15.

What's the ideal number of Lumens and K?

How many hours a day are you running that one that's perfect.

What's the cheapest version you've found? (US Source links appreciated.)

My ideal plan is to duplicate a setup of open top 20 gallon high aquariums for breeding. I want to grow hornwort, maybe some anacharis and other easy hardy rooted plants for fry to hide in. Considering a ring of salvinia or giant duckweed for each tank for those hardheads that have to stay at the surface when born and still snack size. Here's a picture of the first two. Hoping they fill up with hornwort and other out of control growth quickly but due to green water issues from the light, I've already added greenhouse DIY tops and cut back the lighting to 12 hours a day until I can find the perfect light or schedule.
 

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I start with around 20-30 lumen per gallons at 5500 to 6500 kelvin for 8-10 hours per day.

A good idea is to get something that is dimmable so you have total control.
 

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