Choose and write the facts related to LED lamps from the given list.
Require only a small quantity of power , UV rays are produced due to electric discharge , Not harmful to environment since there is no mercury , Intense light is produced when high voltage is applied.

Given below are the steps in the working of a flouroscent lamp. Arrange them in the proper order. Ultraviolet rays are produced , Visible light is emitted , Fastly moving electrons collide with the unionized molecules of mercury, Due to electric current thorium oxide coated heating element becomes red hot .