Outdoor stem mount light control with photocell, controls parking lots, building perimeters, sports fields, outdoor sign illumination & other outdoor uses, turns light on at dusk & off at dawn, works with incandescent, fluorescent, led, halogen, mercury vapor or high pressure sodium bulbs, cfl compatible, includes light level slide adjustment, requires no seasonal adjustments, photo control activates with the absence of light, time delay eliminates flicker & false on/off triggers due to stray car light cul listed.