Not all light bulbs are completely compatible with dimmers, but many are! If you are wondering if a bulb will work with a lamp dimmer, check the packaging to see if it’s compatible. It should have "dimmable" or “dimmable LED” written somewhere and the amount of energy (wattage) it can handle. Many fluorescent bulbs will not work with dimmers or will have some side effects including the bulb color having more of a cool look when being dimmed. Even though you are dimming the light, it will not prolong the life of a compact fluorescent lamp (CFL) bulb. The main bulbs that are dimmable are LED bulbs and incandescents. You can use a halogen bulb with a dimmer switch, but it may reduce the bulb’s lifespan. Some LED dimmer switches will only work with an LED bulb, but you will have to read the labeling of the box or go on the company's website to see if there is a specific pairing.