Just as an FYI, they will replace usage of D1S/D2S on all future vehicles, so beaware when buying ballasts. Differences are:

bulb voltage is about half

socket notches

mercury free

Confusion has already started.. see here:
http://www.xenonvalot.com

Some numbers does not correspond to ECE/DOT norm!

Also see http://faqlight.carpassion.info/hl-hid-bulbs.htm

3800lm for the d4's? d1/d2 produces 3200lm...

Electrical specifications at 12.8V input ballast voltage
­ Maximum power: 38 W
­ Luminous flux: 2800 ± 450 lm
­ Lamp voltage: 42 ± 9 V
­ Rated average laboratory life: > 2000 hrs.

Bulb markings:
­ Brand name: PHILIPS
­ ANSI number: ----
­ ECE identifier: D3R
­ _______________________________________________

Electrical specifications at 12.8V input ballast voltage
­ Maximum power: 38 W
­ Luminous flux: 2800 ± 450 lm
­ Lamp voltage: 42 ± 9 V
­ Rated average laboratory life: > 2000 hrs.

Bulb markings:
­ Brand name: PHILIPS
­ ANSI number: ----
­ ECE identifier: D4R
­ _________________________________________

Electrical specifications at 12.8V input ballast voltage
­ Maximum power: 38 W
­ Luminous flux: 3200 ± 450 lm
­ Lamp voltage: 42 ± 9 V
­ Rated average laboratory life: > 2000 hrs.

Bulb markings:
­ Brand name: PHILIPS
­ ANSI number: ----
­ ECE identifier: D3S
­ ______________________________________

Electrical specifications at 12.8V input ballast voltage
­ Maximum power: 38 W
­ Luminous flux: 3200 ± 450 lm
­ Lamp voltage: 42 ± 9 V
­ Rated average laboratory life: > 2000 hrs.

Bulb markings:
­ Brand name: PHILIPS
­ ANSI number: ----
­ ECE identifier: D4S
­