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Old 10-31-2008, 11:08 PM   #1
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80w ballast

I have two 80w ballasts. Pic link below. Now, these are rated for two 40w bulbs apiece. Can I take one of them and run 4 20w bulbs? This would give me the light I need in my 29 gal SW tank. I figure the other 10w is nominal, I will add a night light to the mix.lol. Is this a feasible project or not?
http://i119.photobucket.com/albums/o...d/S7303328.jpg http://i119.photobucket.com/albums/o154/throwedtoad/S7303330.jpg

Thank you all for your information.
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Old 10-31-2008, 11:47 PM   #2
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If you wire it right so it thinks you have 2 48" bulbs it should work
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Old 11-01-2008, 09:14 AM   #3
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I would not take the chance.
Go to HD or Lowes and buy the proper ballast. Probably not more than $10-$15 for a ballast.
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Old 11-10-2008, 06:40 PM   #4
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That looks like an old magnetic ballast your better off buying a new instant start ballast. HD and Lowes sell them pretty cheap.
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Old 11-11-2008, 12:33 AM   #5
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You can only do 4x20W in an 80W ballast if it is an electronic load-sensing one. What you have is an old coil ballast. It will not work properly with anything other than 2x40.
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