Fully Sealed Optical System Technology is an advanced optical technology in LCD projectors that fully encloses and seals optical components to protect the optical system and provide superior projection effects.

Commonly used brightness standards for projectors include ANSI lumens, CVIA lumens, ISO lumens, and CCB lumens.
    Among them, ANSI lumens is a method for measuring projector luminous flux established by the American National Standards Institute. The CVIA lumen standard is China's first brightness standard for the projection industry and was jointly compiled by the China Electronic Video Industry Association, Dangbei and other upstream and downstream companies. It has more stringent testing standards and requirements and is currently the mainstream projector brightness unit in China.