315w Maxibright Daylight CDM/CMH Lamp
  • Maxibright 315w cdm lamps %28main%29
  • 187757   maxibright 315w daylight 4k cdm lamp
  • 187758   maxibright 315w agro cdm lamp

315w Maxibright Daylight CDM/CMH Lamp


Choose your Maxibright CDM Lamp:

Maxibright 3K Agro CDM Lamp

£89.95 £89.95
315w Maxibright Daylight CDM/CMH Lamp
  • Maxibright 315w cdm lamps %28main%29
  • 187757   maxibright 315w daylight 4k cdm lamp
  • 187758   maxibright 315w agro cdm lamp

Give your Plants a Near Daylight Spectrum with Maxibright CDM Lamps

Ceramic discharge metal-halide lamps (CDM) grow lights have exploded in popularity in recent years. The combination of superb intensity and a spectrum close to that of daylight makes them an excellent choice for vigorous, healthy plants and superb quality crops. The Maxibright Daylight CDM lamps are a fantastic example of this technology. Although they were designed to be used with Maxibright's Daylight Ballast they can be used just as effectively with any quality 315w CDM (CMH) Ballast to equally great effect. 2 versions are available. The spectrum of the 4K contains more blue making it ideal for vegging plants or as a supplemental light to HPS lights to increase crop quality. The 3K Agro contains slightly more red for excellent yields 

  • Fantastic full spectrum light close to that of daylight which plants love
  • Very high PAR light output for amazing growth and yields
  • Full spectrum light increases plant health and greatly improves quality of produce
  • Optimised to be used with a Maxibright Daylight 315w Ballast
  • CDM lamps produce less heat per watt than other HID lamps
  • Available in 2 versions - 3K Agro and 4K
  • 3K Agro version with more red is great as a very productive standalone light
  • 4K version contains more blue - ideal for vegging or as a supplemental light with HPS grow lights


1 x 315w Maxibright Daylight CDM/CMH lamp of your choice

How the 315w Maxibright Daylight CDM/CMH Lamps Work

Ceramic Discharge Metal Halide lamps (sometimes just called Ceramic metal halide, or CMH) have been used for many years for their great light output and spectrum. They are ideal for applications where natural light is desirable like outdoor lighting and car showrooms. I more recent years, they have begun to be used as plant grow lights. There are many advantages to using CDMs as grow lights. Due to their full spectrum light output, they offer fantastic plant health, fast growth and superb crop quality. Compared to HPS, the blue in the spectrum of CDMs reduces the length of the internodes and reduces vertical stretch. Maxibright offer their CDM lamps in 2 versions. The 3K Agro contains lots of red for great yields when used as a standalone light. The larger amount of blue in the 4K version makes it great for vegetative growth or as a supplemental light. When it is used in combination with HPS lights, the extra blue and far-red output of the CDM will greatly increase crop quality by encouraging greater essential oil production and flavour in the end product. 

Light spectrum of the 3K Agro:

Light spectrum of the 4K version:

How to use a Maxibright Daylight 315w CDM lamp:

CDM lamps use a bayonet type fitting and need to be used with a dedicated CDM reflector with the correct type of lamp holder, or with an E40 to CDM adaptor. CDM lamps must only be used with CDM ballasts which are designed to run them. CDM lamps are not compatible with HPS or standard MH ballasts.

If you are replacing an old lamp, remove the old lamp by grasping it and giving it about a quarter turn anti-clockwise. The lamp can then be removed from the lamp-holder. Always use a clean cloth to hold the glass of the new one. This is because the oils on the skin of your hands (even if they have just been washed) can cause damage to the lamp when it is switched on and becomes hot. Note that the 2 pins on the base of the lamp have different size rings on the ends of the pins. Insert the base of the lamp into the lamp holder ensuring that the small ring enters the small hole in the base of the lamp-holder, and the large ring enters the large hole in the base of the lamp-holder. Give the lamp about a quarter turn clockwise to lock it in place (until it turns no more). Your grow light can now be switched on.

Warning: Although CDM lamps produce less heat per watt than other types of HID lamp, when they are switched on they still run extremely hot. As with all HID grow lamps it is necessary to avoid touching the lamp with anything such as fingers or plants as this may cause severe burns or fires. In particular avoid sprays or liquids coming into contact with the lamp as this may cause premature failure or even an explosion.

PLEASE NOTE: All CDM lamps need to be bedded in as follows: on first illumination lamps need to be run continuously for a minimum of 15-30 minutes (although we would recommend that they are first run for much longer such as several hours). This run-in process allow the metals within the lamp to fuse correctly.

If the above is not adhered to, lamp warranty claims will be void.

As with all lamps the light output they produce will decrease with use over time. One Stop Grow Shop recommends you replace your lamp regularly to maintain your garden efficiency.

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