Double-ended or DE Lamps are HID lights (HPS, MH, and CMH) that are run at extremely high frequencies which provides a more stable temperature and operating current. They have more efficient light coverage and electrical use than single-ended lamps and the maintenance is much less than a standard single-ended lamp. They also provide a substantial increase in light intensity and PAR output than traditional SE (single-ended) bulbs. The arc tubes of DE bulbs are generally shorter and thinner than standard SE tubes creating more light from a smaller point as well as emitting more infrared and ultraviolet light which increase potency and essential oil production for some plants.