Burnt smell from H4 halogens

[imj]

Hi...I just joined this forum today/night . I am having some problems with powering 12v automotive H4 halogens from the mains current....what I do is I use an electronic transformer(11.5v output) for halogen bulbs, those can go up to 60 or 105w but for some reason seems to be overpowering the filaments(I think). After a minute on low beam, the bulb emits a burnt smell...seems to be coming from the black coated tip and I just burnt the silver tip on a 90w/100w HID halogen. Is it normal for this to happen?

IMJ

[tebore]

Well with new bulbs the moment they fire up they create some smell from burning off some production coating and dust.

Does it go away?

[imj]

Hi....the 55/60 one has some hours on it and when the wires to it from the transformer is short there will be the smell. The white one 90/100, the smell has gone but after a while I see a burnt area at the silver tip. Btw for the 90/100 I used an Osram halotronic rated at 105w max. Could it be the operating position of the bulb, I operate them horizontal with the low beam reflector facing up.

IMJ

[tebore]

With Halogens the mounting position shouldn't matter like in the case of HIDs.

I've noticed on some Silver tipped bulbs they get a little "toasted".

I'd check all your wiring again looking for shorts.

[imj]

Thanks .

[AutoRoller]

Is there any noticeable degradation in brightness after recharging and using it a few times.

[Handlobraesing]

You can buy high temperature exhaust manifold paint from stores, but first use and high temperature is part of the curing process. It could be that the black/silver coating on the bulb is similar and uses the bulb's heat for curing.