On review, probably not the most intelligent decision I ever made - buying high power bulbs for interior lights - but they're superb bulbs. If you're using these internally and use your car regularly at night, these are probably a touch on the bright side. If, however, you're fitting these in the boot, the glovebox, cubby holes, footwells or for audio installation illumination, these are absolutely the brightest festoons I've ever had my retinas burned by. Highly recommended. For illumination of your car, particularly at night, I'd recommend the slightly cheaper (always a bonus), slightly less powerful bulbs as these generate simply staggering amounts of light.