Dude your going to blow your bulb....your ballast is putting out 400 watts and your light won't handle that for long. Same principles in car amps. You can run a 1000 watt sub and a 400 watt amp. After time you will burn the amp because the sub draws too much power. Your on your way to a house fire. I dont' say that to be rude, but you are playing with fire.
True Dat! You are playin' with fire (literally).
Let's say that you are drinking a 12 ounce can of soda. I'm sure that you could finish it with no problem. Heck, if you're me you could probably down another can without even burping.
Now let's say that same can of soda that you were able to down with no problem before is now bottomless. The truth is, you can drink from this can of soda but because there will eventually be too much to drink because it is bottomless you are going to get full. As a matter of fact if you try to drink the bottomless can of soda to the bottom you will probably explode and catch on FIRE!
Just like you drinking too much soda, your light will eventually explode and catch on fire.