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Compact fluorescents
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2003.09.08(Mon)15:40    Post subject: Compact fluorescents Reply with quote

I was reading the thread and replies on kaoschan's thread on compact bulbs.
A question for all those who converted:

One regular length bulb puts out say 15w spread evenly over your tank.

If I tank a modified incandescant hood and put in two 15w compacts, I have 30w above the plants.

BUT.... do I really? If I have 15w from one end of the tank to the other, now withthe two bulbs I still only have 15w as each bulb lights half the tank....

If anyone can share their experiences on plant growth at the edge of the light fields I would appreciate it...
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Irons
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Joined: 27 Feb 2003
Location: Buffalo, NY

PostPosted: 2003.09.08(Mon)16:26    Post subject: Reply with quote

Well.. using a 10 gallon tank. You have 15W over 5gallons. Or 30 over 10. It isn't spread as nice, but it does the job.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2003.09.09(Tue)8:07    Post subject: Reply with quote

Ah but I need to replace the lighting on my 60g so....
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Steve Hampton
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Joined: 05 Feb 2003
Location: Jacksonville, FL

PostPosted: 2003.09.09(Tue)10:02    Post subject: Re: Compact fluorescents Reply with quote

Discus Man wrote:
I was reading the thread and replies on kaoschan's thread on compact bulbs.
A question for all those who converted:

One regular length bulb puts out say 15w spread evenly over your tank.

If I tank a modified incandescant hood and put in two 15w compacts, I have 30w above the plants.

BUT.... do I really? If I have 15w from one end of the tank to the other, now withthe two bulbs I still only have 15w as each bulb lights half the tank....

If anyone can share their experiences on plant growth at the edge of the light fields I would appreciate it...


It's been my experience that compact fluorescents bulbs have about half the cover field as metal halide. For metal halide we consider two square feet per bulb, compact fluorescents seem to lose potency beyond about 12 inches.

Depending on the type of compact fluorescent bulb, it may be quite a bit less efficient compared to a normal linear fluorescent tube. Most screw base CF's lose a lot of light due to restrike and very poor ballast efficiency. So, does the 30W of screw base compact fluorescent equal 30W of Normal Output linear fluorescent lighting? Never, but for small tanks it's a great option, personally I consider any tank 10G or more to be a poor candidate for screw base CF lighting.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2003.09.10(Wed)11:23    Post subject: Reply with quote

Hmmmnnnn, I had kind of guessed that... thanks Steve.

Is there any change on depth penetration with CF?
I.e. on a 14g high (same base as a 10g) would CF reach the bottom as effectively as the straight tubes or is there a loss that direction as well.

I have a very strange shaped tank, a 20g high with the same foot print as a ten and I am trying to figure out how to make a DIY lighting on such a tall tank. Right now I am fishing for ideas for the 20g or thinking about downgrading to the 14g high. (already have two 10g and I am not fond of the shape... feels like such an itty bitty tank! Smile )

Thanks
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naclh2ofly
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Joined: 07 Jun 2003
Location: MD's Eastern Shore, USA

PostPosted: 2003.09.10(Wed)19:21    Post subject: Reply with quote

Discus Man,
I don't think you need to worry about light penetration until you reach ~ 24". Then metal halides would be the ticket. PCs(power compacts,not the screw-in types) probably have a better "reach" than NOs but at the depths we are dealing with I doubt there is much difference, unless there is some water clarity issues.

On your 20g(x tall?) I would go with A H Supply's 2x36 watt kit. That would give you ~3.6 wpg.

For what it is worth.... I'm running 3x20w NOs on my 20g(24x12x16) and that seems to work well. Of course I don't think I'll be able to grow some of the really high light loving plants like glossostigma but it works for me.

Fred
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