20 gallon incandesent to floro?
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20 gallon incandesent to floro?

This is a discussion on 20 gallon incandesent to floro? within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> so i have a 20 gallon aquarium with incandesent lighting that came with it... it has two sockets that can handle up to 25 ...

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20 gallon incandesent to floro?
Old 04-15-2010, 12:36 PM   #1
 
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20 gallon incandesent to floro?

so i have a 20 gallon aquarium with incandesent lighting that came with it... it has two sockets that can handle up to 25 watts. My question is should i get 2 thin 18 watt cfl bulbs? or should i try and get a new light source with a couple of 24" floro tubes? I currently have java fern growing in the tank.. and in the future i want to have moss ground cover from http://www.adana-usa.com what do u folks suggest?
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Old 04-15-2010, 03:36 PM   #2
 
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You could screw two screw-in CFLs into the sockets but considering the bulbs on the market only give 15W MAXIMUM of light (That's the Hagen Life-Glos and Coralifes give 10W I believe), you might want to get a fluorescent canopy if yo uwant to run more than 1.5 WPG.

In the case that you wind up buying a new canopy I advise that you scrap the fluorescent idea and get some T5 or T5HO lights as they are purportedly more efficient and the bulbs are cheaper to replace.
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Old 04-16-2010, 01:27 AM   #3
 
The answer to your light question is dependent on how planted and what types in your tank. A good light would be the Hagen Glo T5 HO, either single tube (medium light) or double lights (brighter light. T5 H0's crank out more light so you can't use the simple formula of watts/gallon. For example I have the double T5 HO's for a total of 48 watts, so it is easy to think I have 2.4 watts per gallon, but its more like 3.(something) watts per gallon as the output is that much more.

Here is a link to an example of what I"m talking about. The old formula comes from T12 and T8 lights, in this link you see a T8 compared to a T5 HO:

http://www.viaquaria.com/forum/showt...n-to-T8-Output
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Old 04-16-2010, 01:55 AM   #4
 
I would just get two 13 watt spiral compacts. You can't go much over 25 watts, the fixture won't give you much more than that. You might get two 18 watt bulbs to light, but they won't be fully lit.... they probably won't fit either.

You can get screw in CFL that will give you 60 watts if you had the right fixture. IDK what you mean by 15 watt maximum.... really depends what market you are buying from.

T5's and HOT5s are florescent light, I personally don't think you need something that strong. Not unless you want to deal with the increase of ferts and possible CO2. Some T8's would be fine IMO. Since when have T5 bulbs been cheaper than T8's or spiral CFL......
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Old 04-16-2010, 11:55 AM   #5
 
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Quote:
Originally Posted by Mikaila31 View Post
I would just get two 13 watt spiral compacts. You can't go much over 25 watts, the fixture won't give you much more than that. You might get two 18 watt bulbs to light, but they won't be fully lit.... they probably won't fit either.

You can get screw in CFL that will give you 60 watts if you had the right fixture. IDK what you mean by 15 watt maximum.... really depends what market you are buying from.

T5's and HOT5s are florescent light, I personally don't think you need something that strong. Not unless you want to deal with the increase of ferts and possible CO2. Some T8's would be fine IMO. Since when have T5 bulbs been cheaper than T8's or spiral CFL......

I mean that the highest wattage I have seen for made-for-aquariums screw in CFLs is 15W. You could get bulbs from a hardware store but they are usually not as high wattage-wise and the spiral format of 'energy-saver' bulbs makes for a lot of wasted light, assuming you can even fit them in your fixture which is meant for oblong, not round bulbs.
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Old 04-16-2010, 12:26 PM   #6
 
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Maybe 15W is the highest aquarium bulb you can find, but you can use any cool white (6500k) CFL.

But then again, 2 15W fixtures would be enough light for most plants, without the need for CO2 and heavy ferts.
(I have 20W over a 10G, and it's almost too much light)


30W for a 20G would more than likely be plenty- if not, just get 2 18W cool white CFLs.
36W would definately be enough... but would likely be on the bright side.

Remember, the WPG rule was made to measure T5 (normal output) Flourescent tubes-
CFLs are nearly as efficient as t8.

If you want 18's that are guaranteed to fit, I found some.
*18 Watt 6400 K Daylight - $8.99
http://www.americanaquariumproducts....erCompact.html

Don't even think about getting the SHO on that page. You'd blind your fishes.
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