ODNO 20 watt single bulb...
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Old 02-11-2004, 11:31 PM   #1
Phizmo5
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Currently I have a 55 watt PC and a NO 20 watt over a 20 gal tall. I'm hoping to begin growing Glosso in the future and want to up the WPG a bit. Is it possible to overdrive the standard 20watt. Ive done a lot (whew) reading at the ODNO faq page, but little is referenced on smaller bulbs...

Any help Ladies and Gents?

Thanks
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Old 02-11-2004, 11:40 PM   #2
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All of what you read about overdriving bulbs applies to shorter bulbs as well! Just get an electronic ballast that is able to drive 2 or more bulbs, and wire it up, baby!

(all of the usual disclaimers apply... you might turn into a big black toast, bulbs will explode and ballasts burn down the house)

Other than that, if you are careful and kinda know what you are dealing with (electricity) it should work just fine.
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Old 02-12-2004, 01:08 AM   #3
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So all i'd need is a ballast used for Multiple 20 watts...? Or can I use ballasts intended for, say, a double 40 watt, wired to a single 20, and get the same effects?

Thanks
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Old 02-12-2004, 12:57 PM   #4
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I don't think you'll be able to overdrive a single 20 watt bulb. Or at least I've never heard of anyone successfully attempting it. Most electronic ballasts are load sensing and will simply limit current flow to the smaller bulb.
When I hook up a F20T12 bulb to the lead on a F32T8 ballast, it doesn't draw any more current than on a properly matched magnetic ballast.
But even if you wired up the 20w bulb straight up - you'd have a total of 75w on a 20g. If you can't grow glosso with that much light, something else is missing!
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Old 02-12-2004, 02:53 PM   #5
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Thanks Gulf...

The 20 watt just looks dull.. that's all, and not nearly as bright as it would expect. I have it powered by a cheap mag ballast rated for 14 15 and 20 watt bulbs. Its a t12 @ 5000k by GE... perhaps I should switch to a t 8 or swap the ballast? Both?

Thanks for the help fellas.
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Old 02-12-2004, 07:11 PM   #6
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I would swap the ballast, and overdrive it. First use two leads to overdrive 2x. See the article section on the home page for diagrams. If you got a 4x ballast (one that drives 32W bulbs will work fine), you can try a 3x or 4x configuration, but the law of diminishing returns gets you more heat, reduced bulb life, and less gain in brightness.
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Old 02-13-2004, 01:50 AM   #7
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Thanks for the great info Wasserpest. Ill check it out and share what i discover...

P5
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Old 02-20-2004, 04:32 AM   #8
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What a bunch of overdrive freaks!!! I LIKE IT! :twisted: This method has allowed me to grow anything in my 125.I have 4 36" bulbs and 4 bulb ballasts all wired 4x overdrive and that light is BRIGHT! my wife ask if the fish were going to go blind when i fisrt hooked it up and called me tim the toolman. :P
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Old 02-20-2004, 12:54 PM   #9
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Tim Taylor is the official idol of the ODNO-Addicts club, hehe.
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Old 02-20-2004, 01:41 PM   #10
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Hi my name is Rob.. and I am an ODNOholic.

Can I use 2 ballasts for an 8x overdrive ;-)

What can I use on my 10g tank to overdrive it? I want to get some goldfish, No idea why I just always wanted some Orandas. It has a very weak 13w bulb I think (18" bulb IIRC), what bulbs should I be able to find?
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Old 02-20-2004, 05:39 PM   #11
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Uhhh, just in case anyone is crazy enough to try that, haha, please note that Mini was kidding about 8xODNO, mmkay?

I've overdriven two F15T8 18" long bulbs in series before and it is REALLY bright. I estimate output at about the same as a single 65w Power Compact bulb.
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Old 02-20-2004, 06:21 PM   #12
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Who said I was kidding [timvoice]Oooh OOoohh MORE POWER[/timvoice]

I was thinking a something like a 2-F25T8 ballast into a single 18" bulb, should't be too insane.
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Old 02-20-2004, 06:30 PM   #13
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When I measured current draw with 1x vs 2x into a single 18" bulb, it was indistinguishable. Gains are only significant when those small bulbs are put in series.
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Old 02-20-2004, 06:32 PM   #14
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Also www.1000bulbs.com seems to have very good prices on ballasts..

4F32T8 @ $18 ea!
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Old 02-20-2004, 06:33 PM   #15
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Well the bulbs are avaialble too 6500k..
But I can't OD it well :-(
But 15w into a 10 gallon tank, I should be fine anyways,

Lamp,F15t8/D,15 W
Fluorescent Lamp, Standard, Lamp Designation F15T8/D, Wattage 15, Lamp Tone Daylight, CRI 75, Rated Average Life Hours 7500, Color Temperature 6500, Initial Lumens 700, Mean Lumens 615, Starter Type Preheat, Lamp Length (Inches) 18, Base Medium Bipin (G13), T8, Diameter 1 Inch (26mm), Case Quantity 24
Grainger Item: 5V489
Price (ea) : $7.87
Manufacturer: GENERAL ELECTRIC
Mfg. Model#: F15T8/D
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