The technical indicators of LED lighting fixtures mainly include the following nine:
Luminaire efficiency: Under the same conditions of use, the ratio of total luminous flux emitted by the lamp to the total luminous flux emitted by all light sources in the lamp, also called the light output ratio of the lamp.
Utilization factor: refers to the ratio of the total luminous flux on the working surface to the total luminous flux emitted when the bare light source is reached after direct and multiple reflections received on a working surface, and is represented by CU.
Maintenance factor: The ratio of the average illuminance or the average luminance of a specified surface to the average luminance or average luminance of a given surface of a lighting device after it has been used for a certain period of time under the same conditions as the device, and is expressed by k.
Glare: A visual phenomenon that causes unpleasant sensations or diminishes the ability to observe, detail, or target due to inconsistencies in the brightness distribution or range of brightness in the field of view, or extreme contrasts. UFR is used. There are extremely bright objects in the field of vision or a strong contrast of brightness. The resulting visual discomfort is called glare. Glare is an important factor affecting the quality of lighting.
Light distribution curve: Light distribution curve is used to describe the distribution or condition of the light emitted by a lamp or light source in space. It can record the luminous flux, light source quantity, power, power factor, lamp size, lamp efficiency, including lamp manufacturer and model information. Of course, the most important thing is to record the light intensity in all directions.
Beam Angle: The angle of the flying beam of the lamp mainly reflects the maximum range of the spot after being reflected by the reflector of the lamp. Generally, it is the angle between the maximum intensity 1/2 and the two directions of the vertical center light intensity on the same square. The light distribution can be generally classified into: narrow light distribution (<20°), neutral light distribution (20°<40°), and wide light distribution (>40°) according to the beam angle. Of course, there is no strict definition of the beam definition for light distribution. The definition of wide, medium, and narrow is also slightly different for each manufacturer.
The maximum allowable height ratio (S/H) of the luminaire: The ratio of the maximum luminaire spacing to the height of the luminaire when ensuring the required illuminance uniformity.
Power density (LPD): Lighting installation power per unit area (including light source, rectifier or transformer) in watts per square meter, LPD = installation rate/area. There are five factors that affect LPD: the efficacy of lighting light sources; the efficiency of lighting fixtures; reasonable lighting standards; the performance of electrical accessories for lighting sources;
Lamp life: Lamp life is divided into full life, effective life and average life. Lifetime refers to the sum of the time from the beginning of a light source to its inability to start. The useful life is the total ignition time when the total luminous flux of the light source falls to 70% of the initial value; the average life is a batch of lamps ignited at the rated supply voltage and laboratory conditions, and at least 50% of each lamp is fired at least once for 10 hours. The cumulative number of hours that the experimental light can continue to ignite.