Question for folks using CFL Spiral Bulbs
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Old 04-04-2013, 01:18 PM   #1
chale
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Question for folks using CFL Spiral Bulbs


I see a lot of folks using the CFL bulbs with a clamp light. My question is what wattage of bulb would you use for a 10 gallon low light set up and how many (1 or 2)? I'm not running CO2 and don't want to, so recommendation on a wattage and bulb type would be helpful. I do have some cover plants that will block a little light.
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Old 04-04-2013, 01:27 PM   #2
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I think two 20 watt 6,500k will do you good. If you hang them you can adjust their brightness.
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Old 04-04-2013, 01:45 PM   #3
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I use two 13w in a regular fixture because they are inserted horizontally over a ten gallon. I use 1 25w in a clip lamp over a 15g at about 18 inches above the water.
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Old 04-04-2013, 02:28 PM   #4
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Hi chale,

+1 for BruceF's comments. I use 2X10 watt 6500K on my 10 gallon.

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Old 04-04-2013, 02:42 PM   #5
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BruceF and Seattle_Aquarist, how long do you guys run your lights? I'm currently running the T8 for 11 hours.
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Old 04-04-2013, 02:58 PM   #6
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10 hours
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Old 04-04-2013, 03:18 PM   #7
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Hi chale,

I run my light 8 hours using a split photoperiod. I run from 8:00 AM until noon and from 6:00 PM until 10:00 PM.
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Old 04-04-2013, 03:30 PM   #8
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i run two 23w 6500k cfl's over my 10gallon with no co2 for 6 hours a day. Plants have been showing promising growth upwards with reds starting to appear near the water level with pps pro dosing regiment.

This is considered high light and not recommended to someone new at planted tanks. Otherwise, go with dual 13w 6500k cfl bulbs.

Two fixtures are recommended as to provide consistent light across the 20" length of the tank...

Alternatively you can get a large dome shop light but you will likely need to get a higher wattage 6500k bulb and hang the light inorder to provide adequate light diffusion to the substrate level.
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Old 04-04-2013, 03:49 PM   #9
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Thanks all. Looks like I'll go with 2 clamp style lights from Lowes with the 5.5 inch reflector and 6500K 13 watt CFL bulbs. I'll just watch for growth and start out running them around 10 hours or so and adjust from there. Thanks again for the help and any other suggestions anyone has.
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Old 04-04-2013, 03:59 PM   #10
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2 x 19w vertically mounted 10 hrs/day 18" above substrate



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Old 04-05-2013, 10:30 AM   #11
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Well got everything yesterday, but they didn't have the 6500K bulbs. So I went with the 5000K daylight bulbs. Anyone have complaints on these as I know they are still within the spectrum plants like?
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Old 04-05-2013, 12:31 PM   #12
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Those bulbs are fine.
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Old 04-05-2013, 01:27 PM   #13
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read this sticky: http://www.plantedtank.net/forums/sh...t=85667&page=2
page 2, post 21. it's a lot more helpful than most realize.

for the record, i'm using 13w, 6500k, 12-13 inches from substrate, with the bulb vertically pointing down, and co2. it's still relatively new and i'm working out the kinks in balancing everything but so far i'm pretty happy with my growth rate. algae hasn't been a big issue for me.

if I were you, i would either do 1 of 2 things with a cfl bulb setup since you don't want co2 and want low light.

1. if you have a desk top lamp that positions the bulb horizontally, just use that right above the tank.

2. if you're set on using the work lights which you already bought, i would probably raise it 4 inches from the top of your tank, pointing vertically down with a 13W bulb.
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Old 04-05-2013, 03:05 PM   #14
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I have the work lights pointed horizontal from front to back in a crossing pattern. They are 5 inches above the water line and about 14 inches from the substrate.
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Old 04-05-2013, 03:54 PM   #15
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Quote:
Originally Posted by chale View Post
Well got everything yesterday, but they didn't have the 6500K bulbs. So I went with the 5000K daylight bulbs. Anyone have complaints on these as I know they are still within the spectrum plants like?
5000-6500K bulbs are the ideal color temps for plants. So the bulb you have will do just fine.
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