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About HID BULBS

The automotive HID (high intensity discharge) headlight lamps are often referred to as xenon lamps but they are more of a specialized metal halide lamp than anything else.
The main part numbers are:
D2S - plain

 


D2R - like D2S but with heat-resistant black paint on spots to control the light output pattern

D1S - like D2S, but with integral ignitor

D1R - like D2R but with integral ignitor
 
The above are 35 watt lamps. D2S and D1S types nominally produce 3200 lumens of light and the D2R and D1R types nominally produce 2800 lumens of light.