your lamp is a Mercury Reflector Lamp for Industrial High Bay Lighting, it looks Chinese made, the Specs are as follows
Lamp Ref = HRF700PD
Wattage = 700 watts
Bulb = R280
Cap = E40
Length = 415mm
Diameter = 280mm
Lamp Volts = 140 volts
Lamp Current = 5.40 amps
Light Output = 31000 Lumens
All the Best
Colin




