Philips 315W CMH lamps are pretty much the industry standard 315W CMH, or CDM, lamps for growing plants. Other 315W CMH/CDM lamps are available but emit quite different spectrums, they are not as effective for plant growth.
They come in two different models, MasterColour 942 Daylight & GreenPower 930 Agro – both models can be run by the Maxibright 315W Daylight Ballast. They both emit a type of light that is very close to actual sunlight, and plants generally thrive under their light.
They’re available in two different models:
Philips 315W MasterColour 942
Daylight (vegative growth) specific lamp
Promotes vigorous vegative growth with tight intermodal length
Increases taste and aroma of flowering plants
Can be used as a total light source for young plants, or as supplemental lighting alongside HID lights
High efficiency – 1.7 micromoles (µmol) per Watt
Philips 315W GreenPower 930
Agro (flowering growth) specific lamp
Promotes strong structural growth and rampant flowing
Increases taste and aroma in most flowering plants
Should be used as a total source of light for flowering plants for best results
Fuller light spectrum than the 942 Daylight version
Very high efficiency – 1.9 micromoles (µmol) per Watt
PHILIPS 315W CMH LAMPS FAQ’s:
What’s the difference between CMH and CDM?
Nothing, they are exactly the same. CMH stands for Ceramic Metal Halide, CDM stands for Ceramic Discharge Metal (Halide), they are both the same lamp.