There are several types of bulbs that can be used for downlights, including:
Halogen bulbs: These are traditional bulbs that emit a warm, bright light. They are relatively inexpensive, but not as energy-efficient as some other options.
LED bulbs: These bulbs are becoming increasingly popular due to their energy efficiency and long lifespan. They emit a bright, cool light and are available in a range of color temperatures.
Compact fluorescent bulbs: These bulbs are also energy-efficient and emit a cool light. However, they contain a small amount of mercury and must be disposed of carefully.
Incandescent bulbs: These are the least energy-efficient option and emit a warm, yellow light. They are being phased out in many countries due to their high energy consumption.