With HMI light bulbs, youâ€™ll be able to simulate natural daylight even if itâ€™s pitch-black outside. These lamps are excellent for film, TV, video and stage use, and are exceptionally bright, lightweight and cool for safe use during long shoots. So what is HMI lighting? HMI stands for hydrargyrum medium-arc iodide, and signifies a type of bulb or housing that produces efficient, daylight-balanced light running at around 5,600 Kelvins. At BarnDoor Lighting Outfitters, we have HMI lamps in a wide variety of styles, wattages and color temperatures for quality lighting anywhere, anytime.