What in the world is a Reflector?

[talktothetail]

The title states my problem, I have heard about nothing on these "reflectors". I plan on getting a 22 inch Reptisun 10.0 HO and mount it INSIDE the tank. I getting a tank that is 36x18x18 (50 gal).

Anyone who can explain and provide links would be nice.

 

[CooperDragon]

The reflector is the curved piece of glossy metal that fits around the outside of the bulb to deflect the light downward. In this link you can see it fitted around the bulb and under the base of the fixture https://www.amazon.com/Sunblaster-904296-NanoTech-Fixture-Reflector/dp/B00AKKUBDQ/