Ceramic Metal Halides (CMH) are one of the latest innovations in grow light technology. The CMH lamp is constructed of a ceramic arc tube that can reach a higher operating temperature. This triggers an ideal array of metallic gases to discharge delivering a broader spectrum of light that is closer to that of the Sun. The broader spectrum emitted by the CMH grow light will increase the growth and overall health of your plants, translating to increased yields and increased essential oil production.