The Quantum Digital Ballast is yet another top brand item on the market.  One unique feature it has is that it can be used at different voltages simply by changing a cord.  It also has a three phase dimming switch that allows you to run at optimal power of 100% or as low as 50% without changing the bulb.  This feature allows you to control the temperature around your plants while conserving electricity, which makes it very cost efficient in the long run.  On top of your savings benefits, Quantum comes with a 3 year warranty.  In today’s world, it ca’t get much better than that.