Why CMH is especially good for hydro growers versus HPS

Hydroponic CMH Grow Lights

Hydroponic CMH grow lights applications are ideal for keeping both the root (lower) and aerial (upper) growing environment optimal for high yields of exceptional crop quality, especially when growing with water culture systems like NFT (nutrient film technique), DWC (deep water culture) and RDWC (recirculating deep water culture). 

CMH (ceramic metal halide) grow lights deliver more usable light for growing plants versus other types of artificial lighting, watt for watt in any type of growing situation—and especially in hydroponics.

Because CMH grow lights require lower wattages to cover the same sized growing area versus others, for example 315 Watts of CMH grow lighting versus 750 Watts of HPS grow lighting, CMH grow lights introduce less heat into enclosed growing environments like grow rooms, grow tents and greenhouses where hydroponic systems are cultivated.

Less heat from your grow lights is important for hydroponics.  With hydroponic CMH grow lights, hydroponics systems and reservoirs will not overheat easily—the number one cause of problems in hydroponics systems like NFT, DWC, RDWC and aeroponics is when the nutrient solution temperature rises past optimal, ie over 75 Degrees Fahrenheit. When hydroponics root systems overheat, they are prone to problems like root rot; leading to crop failure or yield loss.

The warmer the nutrient solution temperature gets, the less oxygen it is able to hold. Plant disease causing organisms favour anaerobic conditions, ie root zones low in oxygen because of excessively warm conditions.

Hydroponic CMH grow lights are of further benefit when the compact and natural growth tendencies of plants that grown under CMH lighting are exhibited.  In hydroponics, roots have free access to water, nutrients and dissolved oxygen with little or no growing media to get into the way of absorption via the plants root system.  With all of this access to nutrients when combined with bright, hot light as with HPS lighting, plants have a tendency to s-t-r-e-t-c-h, leaving lots of wasted space between potential flowering sites.  Further, this type of growth tends to be soft, and is more prone to attacks from insects or diseases.  Note that “harder” growth is more resistant to problems.

Utilizing hydroponic CMH grow lights, growers are able to better manage the rapid growth rates associated with hydro gardens to ensure that every inch of vertical space is put to productive use; very important when growing under artificial lights because of lighting intensities diminishing quickly with distances travelled. Stacking more flowers into every foot of vertical space growing upwards is key in achieving heavy yielding indoor crops when growing under lights. 

CMH grow lights produce tighter and squatter growth patterns because the spectrum they deliver for plant photosynthesis is closer to the sun than other common artificial grow light sources. Grow lights that are complete in spectrum with a higher percentage of “blue” light, including UV wavelengths provide a more active “photon” for plants to absorb.