LEDs
use a lot less electricity
have little or no flicker
instant on, even in cold weather
produce better quality light
environmentally friendly (No mercury) and no trips to hazardous waste disposal
dimmable
they are small and easy to install
I have been changing to LEDs for a long time. I replaced fluorescent ceiling lights in my shop with LEDs. The fixtures are 1-inch wide and 48 inches long, and they daisy chain together, so I have a continuous. I got 3 times the light and, instant on at full brightness, reduced the cost of electricity by about 25%.