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don't they have differnet energy requirements and you can end up with dead batteries or worse 177
If only the low-beam is out, you will need to replace the low-beam bulb. It is probably not necessary to replace the entire headlight assembly.
The entire headlight assembly must come out to access. Usually there are three plastic clips per side.
how to replace 2007 Mercedes GL450 Headlight Bulb Low Beam
Either from a Mercedes dealer, who can order one for you . Or from a breaker's yard, dealing in European cars.
A sealed beam headlight is just that. The unit is sealed and you replace the entire light. A composite is made of pieces that's why the name. To replace a composite you put a new blub in the back.
Carry it to dealer who will replace on low beam headlight for $15 +/- dollars in about 5 minutes.
On the backside of the headlamp assembly you will see large plastic disc with fins sticking off of it. You need to grab this plastic disc in turn it counterclockwise to disengage the tabs and remove it. This can be fairly stiff due to the O-ring sticking on this cover plate. Once this is removed you will see the ball assembly that is held in with a steel spring clip. You have to push down on the one end of the spring clip and unhook from the latch and swivel it out-of-the-way. This will allow the bulb to be removed from the headlight assembly. Depending on your accessories and plastic shielding that you have not removed that is the hardest part of getting to the back of the headlights sometimes. Read more: Lexus GS 350: how do you replace a low beam headlight bulb - JustAnswer http://www.justanswer.com/lexus/5w3ws-lexus-gs-350-replace-low-beam-headlight-bulb.html#ixzz2FdRpW9Tz
The headlight has two filaments. One for the high beam and one for the low beam. The most likely reason the high beam is out is because the high beam filament is broken. Replace the bulb and it should fix it.
replace the high beam bulb
The Low Beam AND High Beam are in the same bulb. The procedure to change it will be in the owners manual.
replace passenger side low beam headlight