Wow, that's a good idea. I wish I had thought about doing that in my Engine Compartment.
But, here in the US, I don't think they sell regular light bulbs anymore by law. All that you can buy anymore are CF, but I'm not 100% positive. But I think that is the way it is right now.
They are not allowed to manufacture them anymore but there are a few years worth in the pipeline. I think though that a incandescent light bulb is way to fragile and short lived for me to use as a source of heat to keep a seacock warm, a golden rod type of heating element would be more reliable. Though we did once use them for heat in an outdoor cat's house during the winter. I don't think she (the cat) cared much if it worked or not, but the snow sure melted off the top of it.
Winterizing it just makes more sense, along with keeping cabinet doors in front of them open to keep warm air circulating around them.