Symmetrical light distribution type (asymmetrical light distribution type): lamps with symmetrical (asymmetrical) light intensity distribution. Symmetry is determined relative to an axis or a plane.

Direct type lamps: lamps that can emit 90% to 100% of the direct luminous flux to the lower part of the lamp.

Semi-direct lamps: lamps that emit 60%-90% of the direct luminous flux to the lower part of the lamp.

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

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

Indirect luminaire: a luminaire that emits less than 10% of the direct luminous flux to the lower part of the luminaire.

Wide-illuminated lamps: lamps that make the pool distributed within a relatively large solid angle.

Mid-light luminaire: A luminaire that distributes light over a medium solid angle.

Deeplight luminaire: A luminaire that distributes light over a small solid angle.

Ordinary lamps: lamps without special requirements for dust or moisture resistance.

SANITARY FITTING

Protective luminaires: luminaires with a special protective structure to prevent dust, moisture and water from entering the lampshade. The code indicating the degree of protection usually consists of the characteristic letter IP and two characteristic numbers.

Dust-proof lamps: lamps that cannot completely prevent dust from entering, but the amount of entry does not prevent the normal use of the equipment.

Dust-tight luminaires: luminaires that do not allow dust to enter.

Waterproof Luminaires: Luminaires that are constructed to prevent water immersion. Such as drip-proof, splash-proof, spray-proof, rain-proof, etc.

Watertight lamps: lamps that can prevent water from entering under certain conditions.

Underwater lamps: lamps that can be used in water for a long time under certain pressure.

Explosion-proof lamps: lamps with explosion-proof enclosures that comply with explosion-proof use rules for use in explosion-hazardous places.