Scott.... if they are these 75 watt MR-16 bulbs, then each bulb is a 12 degree spot and 17,000 candlepower, and a 3500 hour rating
By comparison, a 100 watt 4509 PAR-36 bulb in most small certified aircraft has a 6 by 12 degree spot. With a 70 hour rating (most owners say less...
...) and a 84,000 candlepower rating.
It seems that all 4 of the Vans bulbs will almost
equal a "standard" aircraft landing light - with 80 % of the brightness - but 50 times the lifetime, and with redundancy.
As you can now guess... the trade off is brightness for lamp life... the aircraft bulb is bright for a short time, the MR-16 halogen bulbs are nice and white, and last a long time, usually in your kitchen....
If you want more data, a big list is here...
I've made some assumptions here... can anyone verify that the bulbs in Vans kit are MR-16 (2 inch diameter) and give a part number?
I've also seen the 4905 bulb listed at 110,000 candlepower, 30 % higher than thew assumptions above....
4905 info http://www.donsbulbs.com/cgi-bin/r/b.pl/4509~usa.html
MR-16 pic http://www.buylighting.com/images/in...y/346image.jpg
Can anyone give me the bulb part number from Vans kit??
gil in Tucson