What is the difference between D2 and D4 xenon bulbs?

   The main difference between D2 and D4 bulbs is voltage: D2 bulbs require 85 volts, while D4 bulbs require only 42 volts. These bulbs cannot be interchanged. If a D2 bulb is installed with a D4 system, it will turn on, but shut off after only 2-3 seconds as the ballast lowers the voltage to 42 volts.Additionally, D4 bulbs are more environmentally friendly, as they are free of mercury.

  ★ Feature and Parameters

* Glass bulb shape:  adapt diamond glass bulb design, which lighting source is much close to halogen bulbs. Anti-dazzle and lighting focusing. 100% focus accuracy, UV blue bulb glass

* Unique separate lamp holder and wire harness design, plug and play without high voltage wire that reduce the high pressure radithion, more suitable to USA DOT standard, more easier to install and safer to use

* Perfect lighting uniform. No color difference, 3000 hourrs lifespan

* 50% brighter than original HID, 350% brighter than halogen bulbs

* 30m longer projection range than original HID, 3800 lumens output

* Derived from the most advanced equipment and excellent technology, it adopts the APL pills from USA, xenon gas from Germany Messer, Austria plansee tunsten metal electrode, pure pills with xenon ensure product consistency and lifespan

* Completely filter ultraviolet radiation, reduce damage of headlamp reflectors to ensure normal lifespan

* warranty: 2 years

* Power: 35W