Metal Halide lights are HID lights that are best used for the cloning and vegetative stages of your cannabis plants. They produce a bluer light than High-Pressure Sodium lights, which are better suited to your plant's flowering stage. When using a High Intensity Discharge system, these two lights should be used in parallel, changing bulbs to fit the appropriate stage of the cannabis life cycle. JUMP TO HID, METAL HALIDE, HPS