DIY - blue interior lights :)

all colored bulbs get extremely hot. I don't think your sharpie bulbs get hotter than my bimmian xenon bulbs. One of them just melted the housing which broke the glass on the bulb. I think the the only problem with yours is that the coloring will fade and you will have to keep recoloring it

Alright, when you color a light bulb, it only lets a portion of the created spectrum out of the bulb. The rest bounces around inside until it is converted to heat energy.

Now, if some spots have thicker sharpie on them than others (which is very likely), they will let less light out, therefore getting hotter.

When parts of a glass bulb get hotter than others, it weakens it and makes it prone to shattering.

Too late for me to edit my last post, but;

Note: It makes it *prone* to failure. It might not actually make it fail. It might last the life of the car (minus the fading) or it might explode tomorrow. But its really pointless, since a aftermarket kit is cheap.

I just put Jlevis led set in a 99 323i and what an unbelievable difference, the overhead and c pillar lights alone transform the interior. Its my 19 yo's car and he agreed it was great. I put some in my 01 530 and again great!
well worth it. now these are the led which burn cool, the old bulbs are so hot the sockets had turned brown on some (talk about burning the car up!)
It does pay to turn the row of leds just right cause they are very directional

i just wouldnt waste my time doin this