Hey Ray,
Drop this baby in....
Mercury Vapor Lamp Ballast
Catalog Number 74P3303
For 175W H39
60 Hz HX-NPF
POSTLINE BALLASTS
For high intensity discharge lighting applications
Utilizing HID lamps in post mounted applications
Exclusive spring clip and chain (factory pre-assembled on all ballasts 100 watts and greater) maximizes ballast life by providing a path for heat dissipation. Experience has shown that without adequate heat transfer, ballast life will be shortened. The spring clip holds the ballast against the interior pole wall, thus allowing the ballast to transfer its heat to the pole. The 18" long chain permits the ballast to be lowered into the pole, eliminating heat buildup around the ballast. The results are increased ballast life and elimination of ballast cycling.Simply attach chain to a convenient tie point at pole top, connect leads and push ballast down pole.
http://www.advancetransformer.com/products/postline.asp
