ttystikk
Well-Known Member
A single 1000W bulb pulls more than 1000W at the ballast. (4) 250 w bulbs will pull even more because 1: each 250W bulb actually uses slightly more than 250W@the ballast, and 2: you now have 4 times the resistance because 4 bulbs. You could probably run 3 250's off a 100W ballast and overdrive them a little, it will shorten bulb life, but not considerably. Personally, I think that much light in a 40" circle is going to be an oven...
This logic is incorrect; all lamps pull the wattage they're fed and magnetic ballasts are designed to handle it by using a bit more power, somewhere around 5-15% depending on the age of the components inside. Digital ballasts don't pull extra watts because they don't need to.