General Installation for 4 x 5, 5 x 7 and 8 x 10 Enlargers
Aristo units designed for installation on 4 x 5, 5 x 7 and 8 x 10 enlargers come in a single unit and are generally
self-contained. These normally are equipped with two cords on the cold light head. The two pronged cord operates the
lamp and may be plugged into your timer or footswitch. The three prong cord, which operate the thermostatically controlled
heater, is plugged into any available 115 Vac outlet.

Aristo Cold Light Head General Installation Information