Hey..
I have just recieved my Sonlight Electronic ballast and Sylvania 150 w bulb. I only grow 2 plants in hydroponics in a small space.
The ballast does light the bulb up very quickly, about 45-60 second to full strength.
The actual power-consumption for the ballast is 158 watts wich is not bad.
Its is advertised to be 20-30% more energy efficient and the bulb will last 12-14 months before massive loss of lumens.
+absolutely no noice at all, it does'nt buzz like a magnetic ballast!
I'd have to say, im diggin' it!!