Before electricity, lighthouses relied on lamps that would almost be considered mood lighting by today's standards. Mechanisms were clockwork and had to be wound as often as every two hours. In the 19th century, Fresnel designed a lens that could focus this light into parallel rays and project it horizontally, dramatically improving lighthouses. By the end of the century, all lighthouses had Fresnel lenses classified into orders, with first order being the largest and most impressive.These days lighthouses use less elaborate lamps such as the beacons found at airfields, or even powerful, but unremarkable to look at, LEDs. Here is a list of some of the most beautiful and important lights ever made, including some 1st order beauties that stand 20 feet tall, and were floated on a mercury bed. There are no descriptions of each item, for this chart, as the images speak for themselves, however, the sites linked to have information about the lighthouses where they came from.