The 817 is a Lightolier track compatible, double adjustable spot that employs two MR16 halogen lamps. It's ideal for independent highlighting or may be used in tandem to cover a larger subject. Equipped with a electronic transformer that will work with most dimmers. Clear lens supplied. Lightolier track compatible, double adjustable MR16 halogen lamps. Electronic transformers work with most dimmers. 6 1/8" high. 7 3/4" wide.