Does anyone know roughly what light ouput in Lumens I would expect from an average automotive 21W 12V filament bulb?

I have searched everywhere and simply cant find an answer...

I THINK its around 400-450 Lumens but that is for white light. Automotive applications will have coloured light and therefore the measurement is more tricky.

I'm intrigued - why do you ask? LED conversion perhaps? If so I can help.

[Edited on 2-12-07 by RazMan]