Change A Light Day
Change A Light Day is held on October 1. First Sunday of October. This event in the first decade of the month October is annual. 
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Light energy is the only energy visible to the human eye. Light rays have different colors due to differing wavelengths. The speed of light is approximately 300,000 kilometers per second which is faster than the speed of anything else!
CFL and LED light bulbs last longer than incandescent bulbs, so there are fewer bulbs to replace over time. They use a fraction of the energy to run than incandescent bulbs. This saves valuable energy resources and lowers your monthly energy bill.
CFLs use up to 75 percent less energy than traditional incandescent bulbs. CFLs can last up to 10 times longer than incandescent bulbs, saving on production and disposal costs. These energy efficient light bulbs produce less heat saving on cooling costs. These bulbs cost less than LEDs.
Similar holidays and events, festivals and interesting facts
Mud Pack Day on September 30 (The use of mud for therapeutic and beauty purposes can be traced back to the 16th century during the Renaissance);
Junk Mail Awareness Week on October 1 (Junk mail isn't just annoying. Take a day to think about that and maybe take some action - sign up for Do Not Mail lists, or post a note on your mailbox declaring it a junk mail-free zone);
CD Player Day on October 1
Balloons Around The World Day on October 1
World Farm Animals Day on October 2
World No Alcohol Day on October 2
Techie's Day on October 3
Virus Appreciation Day on October 3
Mushroom Day on October 3 (unofficial mushroom picker holiday - silent hunt);
Mean Girls Day on October 3
Fullmetal Alchemist Day on October 3 (celebrated by manga and anime lovers)