What does CDM stand for in lighting?
The ceramic discharge metal-halide (CDM) lamp, often referred to as ceramic metal halide lamp (CMH) is a source of light that is a type of metal-halide lamp which is 10-20% more efficient than the traditional quartz metal halide and produces a superior color rendition (80-96 CRI).
What’s better led or CMH?
LED bulbs last 50,000 hours compared to 20,000 for CMH. If you are planning for obsolescence and want the greatest yield ROI within 1-2-year time frame, choose CMH. And even if you keep your grow space past 5 years, don’t worry, CMH’s provide a greater gram per watt due to their higher PPF and canopy penetration.
What’s better CMH or HPS?
High Lumen Output — A 1000w HPS bulb gives you 130,000 lumens in a single light! Meanwhile, the highest amount of lumens CMH lights can offer you is 72,000 to 75,000 — and that’s with 2 bulbs. That means a single HPS bulb is 3 times more powerful than a CMH bulb.
What is a CMH grow light?
What is a CMH Grow Light? As its name suggests, a ceramic metal halide grow light uses a ceramic arc tube as opposed to a standard MH grow light, which uses a standard quartz arc tube. This stronger arc tube material helps the CMH bulb operate at a much higher pressure than the average MH bulb.
What is the difference between metal halide and ceramic metal halide?
The largest difference between MH and CMH lamps is the Ceramic or “C” in CMH. This refers to the arc tube material, which is made of a ceramic material – similar to what is used for HPS lamps.
When did metal halide come out?
1912
Metal halide lamps were invented by Charles Proteus Steinmetz in 1912 and are now used in almost every city in the world.
How far should CMH lights be from plants?
As with the HPS & MH light, you should conduct a hand test to see how hot the light is. Once you have done that you can estimate the distance needed between plant and light, however, typically you should hang a CMH bulb two feet above the canopy of your plants.
Can you flower with CMH?
Weaker in Flowering Than HPS If you compare CMH to HPS on a watt by watt basis, CMH lights do have a more balanced PAR spectrum than HPS lights. And research is still being done to figure out if the added benefit of a better spectrum improves the overall crop even with the diminished harvest.
Which lamp is used in outdoor games?
Sodium vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio typically of 80–140 lumens/watt. This making them a cost-effective choice when certain lux levels must be provided.