Wow guys, I wasn't expecting this much info when I got back! :) it seems I have forgotten stuff since I last dabbled in electronics! I once made a solenoid gun recoil for mame powered via a Parallel port using opto isolator but I forgot about using mosfets. You are all right, I was expecting the opto to act like a switch...that is off or on and it was rated upto 36v on the output side so just assumed I could drive a 24v bulb from the 24v power. Bugger!
I also don't really need the isolator for the bulbs!
I also just found the leftover mosfets but I'm thinking they may be a bit overkill for a bulb. I wonder how hard it would be to fit a LED into the switches?

Cheers guys

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