With that said, we’ve made it clear that CMH has a much better overall spectrum than MH, with higher red and white light overall outputs. Metal Halide Grow Lights: These lights are great for early-stage plants as they emit a cool blue shade of the visible spectrum which helps the plants grow in size and generate more leaves and develop more foliage in general. GE. But not anymore. Traditionally gardeners would use the Metal Halide fixtures for vegetative growth and the High Pressure Sodium (HPS) fixtures for flowering. Like fluorescent lamps, HID lamps produce light by the excitation of a gas confined between a pair of electrodes and require a ballast to limit current draw and to provide proper starting and operating voltages. Metal halides are usually screwed into a reflector or hood to create even more light for the plants. A little more about me. When Should You Use a Metal Halide Grow Light? A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine). Nowadays most high quality metal-halide bulbs are rated for universal positioning. High Pressure Sodium bulbs on the other side are great when it comes to increasing your flower output and fruit growth. If the bulb is powered from a constant voltage source such as directly from the AC wiring, the current will increase until the bulb destroys itself. CMH grow lights also go by the name Ceramic Discharge Metal Halide (CDM), the lights use ceramic technology and they have the qualities of metal halide and HPS grow lights. They’re both great for what they do. Protopia’s 1000W metal halide light is among one of the most preferred names when it comes to growers who want to grow commercial-grade weed. The light has a wide spectrum and a good cri that resembles natural light from the sun. Blue Spectrum Grow Lamps for Vegetative Growth. A CMH uses a ceramic arc tube similar to those used in HPS grow lights instead of the quartz used in traditional metal halide grow lights. It is more expensive than other competing CMH bulbs in the market. Hi, I'm Kevin. Because of the nature of the processes that produce light within these lamps, they output significant heat into their immediate area. Just like HPS and CMH bulbs, MH bulbs need a ballast to run. Metal Halides also produce more pure white light than the HPS lamps, closer to daylight frequencies making it especially useful for growing plants. A metal halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides. Now, this is the light spectrum of the average Metal Halide grow light: Notice the those peaks in the Blue, green, yellow and orange? Sun system LEC 315 light Emitting Ceramic Metal Halide: Best all in one. For a more detailed look, check out my in-depth article on ceramic metal halide lights. So that’s can be said that CMH is a mix between MH and HPS. Sun System is a champion … MH bulbs are also very good at stopping stretching. There really is no contest between these HID lights, it would be unfair to compare the two. Here are the average lumen output form different Metal halide grow lights: 150 W -> 12,000 lumen = 80 l/W; 250 W -> 21,000 lumen = 84 l/W; 400 W -> 36,000 lumen = 90 l/W The Metal Halide bulb is an excellent choice for plants growing VEGETATIVELY. 101GrowLights. HTG Supply Air Cooled 400-Watt Ceramic Metal Halide (CMH) Complete Grow Light, Bulb Included - 120v $238.95$238.95 $32.13 shipping Only 18 left in stock - order soon. HPS lights are about twice as efficient in terms of power use as metal halide lights, so in other words, they run cooler and they cost you much less money to run as well. Metal Halide lights are used during the vegetative growth stage of cannabis plants that are grown for medical marijuana. FREE Shipping by Amazon. Usually they’re rated with a high lumen output of around 100 lm per watt, a lamp life of up to 20,000 hours and pretty decent degradation rates. Limited time deal. It’s worth noting is that these HID lights are usually very similarly priced. Item #1100158. Compare; Find My Store. GE CMH20/TC/U/830/G8.5 Constant Color Metal Halide Replacement lamps T4.5 controlled by M156 Ballast Brand: General Electric Lamp type: High Intensity Discharge - Ceramic Metal Halide Which is less than the 24,000 Hours that CMH are rated for. I’ve put up this guide in order to help you learn about Metal Halide grow lights, how they work, their advantages, and their downsides. 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