Lamp type terms

Lights:
Instruments capable of transmitting light, distributing, and changing the light distribution of the light source include all zeros and parts required for fixing and protecting the light source except the light source, and line accessories necessary for connection with the power source.

Symmetric light distribution type (asymmetric light distribution type):
A luminaire with a symmetrical (asymmetric) light intensity distribution. Symmetry is determined by one axis or one plane.

Direct type lighting:
Can emit 90% to 100% of direct luminous flux to the lower part of the lamp.

Semi-direct light fixtures:
A lamp that can emit 60%-90% of direct luminous flux to the lower part of the lamp.

Diffuse lamps:
A lamp that can emit 40% to 60% of luminous flux to the lower part of the lamp.

Semi-indirect lighting:
A lamp that can emit 10% to 40% of direct luminous flux to the lower part of the lamp.

Indirect lighting:
Lamps that can emit direct luminous flux below 10% to the lower part of the lamp.

Wide lighting type:
Lamps that distribute the pool within a relatively large solid angle.

Zhongzhao lamps:
A light fixture that distributes light within a medium solid angle.

Deep lighting fixtures:
Light fixtures that distribute light within a small solid angle.