I'm not in the business of starting Big Jewish Debates, but I've never fully understood the Orthodox logic that turning on a light bulb is starting a fire.
I would argue that a fire is combustion, which is an exothermic chemical reaction between a fuel and an oxidant (usually oxygen). But light bulbs are specifically filled with inert gasses, isolating the filament from oxygen so that it will not combust.
That said, 1) there may be something I'm missing in the Hebrew that makes this more ambiguous than I understand, and 2) you can do whatever you want forever. I'm not gonna get mad at anyone for not turning on lights on the sabbath.
