led lenses?

[dryworm]

what are these lenses for? i see 40, 60, 80 degrees. what does that mean and whats their purpose?

[kotlec]

To concentrate light in to narrower beam. Useful if your leds are at a bigger distance from target.

[Floyd R Turbo]

For display tank lighting. Not for scrubber lighting. Unless your light fixture is far away (12")

[RkyRickstr]

Yup.. and also should be mentioned that the narrower the beam tge more par you get. So people with deeper tqnks go with a narrow lens to get light to the bottom. Keep in mind you might need more leds with narrow lenses.

[kotlec]

Ye, good morning :D

[joelespinoza]

As long as you keep your display light close to the waterline and dont have a tank much more then 24" you wont need them. Less expense and looks better too.