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Old 08-24-2006, 11:35 PM   #1
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Can I use 40 watt balast on 30 watt sylvania grolux for overdrive.
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Old 08-25-2006, 02:16 AM   #2
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Old 08-25-2006, 11:29 AM   #3
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I'v already read this topic. But this topic about 2X, 3X or 4X overdriving. I want to know 1X electronic balast overwatt overdriving. Did you try this?
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Old 09-02-2006, 01:15 PM   #4
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I have 2 x 3 ft flouros. in the factory fixtures over my 125. I modified them with elec. ballasts designed to drive 4 x 4ft lamps, and am using all the outputs of each ballast on each 3 ft. bulb.
That would equal 4x overdrive on a 4 ft bulb. Maybe a little more on the the 3 fts.

I don't have plants yet, as this is a test of light output vs. lamp life.
They ARE noticeably brighter, as well as warmer to the touch, but so far (about 5 mos. now) they have had no issues other than growing algae in the tank more than at normal output.

By standard fixtures I mean the normal plastic single bulb strip lights that come with tank packages.

As far as your 1x overdrive question, I think its a moot point.
1x is not overdrive, it's normal output. Can you use a 30 watt bulb with a 40 watt ballast ? sure, but it won't be overdriven I don't think.
Most electronis ballasts "sense" the bulb attached to the output and will "compensate" somewhat for a lower wattage bulb by delivering less voltage to the outputs.
Where overdriving comes into play is when you use a multi bulb ballast to drive a single bulb with multiple ballast outputs.
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