OT - MOSFET choice

[Scampy]

I have knocked up an output circuit that works, but may not be ideal. All I had in the way of MOSFETs in my component box was an IRF3708.

I've used a BC639 to drive the FET using the attached schematic. I've tested this with a six bulb 1/12th chandelier which drew just over 310ma, and a twenty-one bulb light that drew 1100mA and it worked really well... OK the additional 16 transistors and 48 resistors is not much to accommodate in the design, but it would be better for a single component.

As each channel could end up driving 60 x 50mA bulbs, I've rated rated the device at 3 to 4 amps, but as most of these MOSFETs seem to be rated at 30Amp - 600A or more I don't think I'm going to be taxing them too much. Is it worth looking at these multi-fet devices in SOIC / DIP packages, or would they need cooling ? That TO 292 package that Gusse linked to looks an alternative if no DIP device is suitable.