The companies who make them call them lamps, replacement lamps. You can also call them bubbles or globes, but not bulbs. Bulbs grow in the ground. We stock replacement lamps for most portable lights. From 6, 12 or 30 volts, 10 watts to 250 watts. Also 120 volt lamps, and of course 240 volt lamps, from 150 watts to 5000 watts. We keep MSR lamps (single ended HMI), and a few fluorescent tubes.