250 watt MH ballast(s)

[fkshiu]

Originally Posted by Slick Fork

I'd be curious to see if the decrease in power consumption is comparable to the decrease in par. For example if the power consumption drops by 15% does the par drop 15% or is it more or less dramatic? Just how much more efficient would an E-ballast be over a traditional magnetic?

Also, what about electronic interference with other stuff such as televisions, radios, aquarium controllers,etc.?

That's easy to figure out. Look to Sanjay's light testing results:

http://www.manhattanreefs.com/lighting

You see how the PAR (PPFD) drops as the power (Watts) drops from an HQI, to magnetic, to e-ballasts? However, the efficiency remains relatively stable. Different bulbs will react somewhat differently but if you check out Sanjay's other results, the trend is fairly constant.

A properly built e-ballast in an enclosed Faraday Box (i.e. made of metal) should not give off electrical interference (EMP).