There are even some companies that offer this style of conferences as meetings for money to vendors.
What I wonder though: How many deals are really made in these rooms? I always had the feeling that the conversion rates were rather low if not zero.
After all, even in the countryside the darkness usually is far from complete. You still see quite a few meters without any headlights. Though the tradeoff would be different for cars with their much higher speed.
I don't know about the UK, but out here in France, this is wrong on most counts. Many country roads have no lines, reflective or otherwise. There will be pedestrians walking around. Also, roads are not always in tip-top shape nor clean, so you need light to be able to see.
However, I do agree that maybe extremely bright lights mounted high are a nuisance.
I remember reading about a case where criminals bought an entire issue of a local lottery, thus collecting all the prizes, and apparently saw that a reasonable cost to launder their cash.