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