HID lights are High Intensity Discharge lights.
HID lamps, or light bulbs, are high-powered light sources. They include Metal Halide lamps and High Pressure Sodium lamps. EYE HORTILUX® HID lamps are manufactured specifically for indoor horticulture. They supply artificial light for indoor plant growth.
Unlike incandescent light bulbs, HID lamps do not have a filament. HID lamps are electrical discharge lamps. This electrical discharge is similar to the arcing of a lightning strike, only with much lower power and much longer duration.