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Hey guys! What's the significant advantages of one ballast over another? What should I be looking for? Example: $40.00 http://www.ebay.com/itm/NEW-Bloom-Bright-430w-watt-Electronic-Ballast-240v-For-Grow-Light-Lumatek-400w-/261328215247?pt=US_Hydroponics&hash=item3cd8601ccf vs $130.00...