What's the difference between OEM xenon HID bulbs

Philips Made In Germany D2S Xenon HID OEM Replacement Bulbs #85122

D4R OEM Xenon HID Replacement Bulbs for Headlamps Headlights Head

Super Bright Oem 35w D2s Xenon Hid Bulbs - 4300k 6000k For Car

What does OEM HID Mean?

How HID Headlights Work & How to Upgrade to HID Headlights

50w HID Xenon Bulbs sets H1,H3,H4,H7,H8,H9,H10,H11,HB3,HB4,HB5

AutoTrends White 2pcs D4R HID Bulbs 35W 4200K Xenon HID Headlight

66144 Original D1S 35W 4200K NEW OEM Parts For X1 X3 X5 X6 CC

What Are HID Headlights?—Car and Driver