Giesemann Fixture - Tridonic Ballasts

[es355lucille]

Hey Mike. Thanks.......I am looking at the icecap external ballasts.....but I would have to buy two of these. I was sure I seen an external 250 MH dual ballast somewhere...not that they would be cheaper, just one unit would be nicer.

Originally Posted by mike31154

I believe your assumption is correct. Any 250W ballast (electronic or tar), not to mention a dual is going to be much larger than that unit you have currently. Unlikely that it will fit into the fixture and even if it did, would certrainly generate additional heat which the fixture may not be rated for. External ballast(s) looks like the best option.

[lastlight]

Try the Galaxy ballast.

http://www.jlaquatics.com/phpstore/s...ID=SL-MHBW2507

[mike31154]

Originally Posted by es355lucille

Hey Mike. Thanks.......I am looking at the icecap external ballasts.....but I would have to buy two of these. I was sure I seen an external 250 MH dual ballast somewhere...not that they would be cheaper, just one unit would be nicer.

I haven't seen many duals that are separately controllable, so when you plug it in, both bulbs will fire. While some of the dual ballasts have a switch for each circuit, they typically only have one mains cord so if you wish to use a timer, your options are limited. With separate ballasts, you have the option of putting each on its own timer, with the disadvantage of more bulk.