I have a 150watt power supply from my beige G3. And I have a 10 watt 12 volt halogen bulb that I have connected to it. When I have the bulb connected in it the fan increases speed quite a bit (the fan varies speed according to load). My question is, what percentage of the max draw does this 10w halogen lamp consume? Does it consume 12% or does it consume more? If it consumes 12% then a 150watt power supply should be enough for nearly any regular PC, but I see that 400 watt is minimum today and even that is not always enough. P.S. A little story about the halogen bulb: When I first plugged it into the PSU and played around with it a bit I soon broke off a pin. The pins cannot tolerate bending so if you bend it at all then it may break easily. So I had to dig into the glass base of the bulb until a stub of metal sticked out, then I dumped a blob of solder and a wire to make contact with the stub. Also soldered a wire to the good pin (that was the easy part) Then I used e.tape to wrap it up so the wires dont rip out. Problem is that after using the light for a while it starts to roast/melt the e.tape and make a smell. That's the short story of the halogen bulb.