Ceramic Metal Halide (CMH) Lighting
AKA Ceramic Discharge Metal Halide (CDM) and Light Emitting Ceramic (LEC)
As the name suggests this type of lighting is a development of the older metal halide bulbs where ceramic arc tubes are used instead of the traditional quartz glass. This allows a spectrum to be produced that can combine both the traditional metal halide and hps bulbs.
Advantages
Wide spectrum – the ceramic tube can withstand much higher temperatures and allows a wide spectrum of light to be emitted which is much closer to sunlight. This replaces the need for bulb specific spectrums i.e. MH and HPS
Better PAR Efficiency – Traditional Metal Halide bulb had a low efficiency of 0.9-1.1 umol per watt ( light produced by a single watt of electricity). HPS is in the order of 1.5. CMH is pushing this up to 1.7-1.9 so electrical savings can be made
Long Lasting – The ceramic tubes mentioned above are far more robust and allow CMH bulbs to run upto 24,000 hours. By 20,000 hours 80% of the output remains. Some hps bulbs have lives of just 10,000 hours.
Ultra Violet – Know to have branching benefits in vegetative stage
Disadvantages
Flowering – while the lighting is capable of growing plants from seed to harvest, the red spectrum is limited compared with pure High Pressure Sodium bulbs so HPS can still outperform CMH in the flower cycle
Ultra Violet – UVA,UVB and UVC are produced by CMH which is harmful to humans.
Expense – The cost is approximately double that of traditional HID
Heat – The spectrum produced is much wider than plants can see and this results in unnecessary heat although it is less than existing HID
Current diary
https://www.thctalk.com/cannabis-foru...le-Sun-Led-Kit
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