Heat is the enemy why the new of ail things mechanical which is G2 18K HMI Fresnel offers dramatically improved cooling features. From the unibody speedring to the "fresnel" reflector the G2 is designed to cool and protect critical components. The end result is a fixture that lasts longer, is easier to work with, and costs less to m a i nta i n. Call us for G2 - more engineered for the professional. information 1-800-SUNRAY-1 or 925-251-9030 Visit us online at: www.sunray-lighting.com 5653 Stoneridge Dr., Suite 101, Pleasanton, CA 94588