A "lightbulb" is a small device that produces light when connected to a power source. It is often used to illuminate homes, buildings, and other spaces. Full definition
Stallone, as mentioned, has never been the strongest director (appropriately, he reaches a brief nadir during his biggest hit, when, in Rocky IV, he fixes on a field of lightbulbs in a light - up sign and then zooms way in for no particular reason). (film.avclub.com)
Like a lot of cult movies though, it has it's flaws; the settings are basic and it has the old flashing computers with an abundance of lightbulbs on show but it's testament to Carpenter's vision that his concept overrides these dated faults and the film still manages to remain suitably futuristic. (markedmovies.org)