These CIBIE Driving Lights were used by Porsche and installed in the 914-6 GT https://pbase.com/9146gt/image/88001752 - https://pbase.com/9146gt/image/22405016 and in fact, also used by several other makes during rally and road racing events. The casing of these particular CIBIE IODE 45 Series lamps were made from stainless-steel to avoid rust and are fantastic lamps for 60's/70's period correct/vintage road racing cars.

To get a better understanding as well as a good visual idea of how these lights work, you can take a quick look at the two following links. You can read a bit about 'candlepower' in this short article https://pbase.com/9146gt/image/118911707 and also see an enhanced photo clearly showing the fog lamp and a driving lamp's ability to light the road ahead https://pbase.com/9146gt/image/118911780

...Why yellow lenses? Where did they come from? Good reading http://www.danielsternlighting.com/tech/lights/light_color/light_color.html

DISTRIBUTORS / WORLDWIDE: http://www.eurofac.fr/cibie/phare-cibie.php - ClearCorners.com http://www.clearcorners.com/products/cibie/ - AlfaCyberSite http://www.alfacybersite.com/ACSCibCt.html