Question

write in short abut led .they have becomepopularthan cfl. why

Answer 1

When it comes to lighting our homes, we are encouraged to switch outdated incandescent bulbs to more energy efficient alternatives. And, most often, these alternatives are LED and compact florescent lights (CFL).

The decision between the two is often based on some variation of the following assumptions: LEDs are more efficient than CFLs. LEDs also cost more than CFLs but they last longer, so you’ll make up the initial cost over the lifetime of the bulb.

Since about 74% of US houses have at least one energy efficient light source in them, I assume this internal discussion happens quite often in the lighting aisles of home improvement stores.