This are the must common used light bulbs. They are used with electricity, in which the energy heats up the filament. The filament is made of argon/ nitrogen gas. Incandescent bulbs produce a steady warm, light that is good for most household applications.

These bulbs work by passing electricity through a tungsten filament, which it has halogen gas. The halogen gas cause a chemical reaction in which it takes place the tungsten, and it pass it back the filament. The advantage is that it provides a brighter light, but it takes more energy than the incandescent bulbs.

High Pressure Sodium (HPS), Metal Halide, Mercury Vapor and Self-Ballasted Mercury Lamps are all high intensity discharge lamps (HID). Compared to other light bulbs they emit, a bigger light from a small bulb. HID lamps produce light by striking an electrical arc across tungsten electrodes housed inside a specially designed inner glass tube. This tube is filled with both gas and metals.

Low-pressure sodium lamps have the highest efficacy of all commercially available lighting sources. Even though they emit a yellow light, a low-pressure sodium lamp shouldn't be confused with a standard high-pressure sodium lamp.