General Information of Downlights
November 19,2020
Besides the main lights, in the light decoration, people also use spotlights and downlights for the lighting need. However, do you clear about the difference between spotlights and downlights.
Downlight is a downlight type flood light source. The light-emitting surface is covered by a sand acrylic diffuser. The beam angle of the downlight is relatively large, usually> 120 degrees. Spotlight is a general term for directional and highly concentrating lamps. Directivity: By adjusting the direction of the lamp, the light is projected to the designated area. The high concentration of the spotlight means the beam angle is small.
What should a good downlight possess?
Durable and Practical
Light source:
As one of the core components of the downlight, it is like the CPU of a computer. The quality of the light source is directly related to the life of the lamp, the color rendering index, and all aspects of light health. It is best to choose a brand with cutting-edge chip technology, such as Osram and Philips.
Drive:
As another core component of the downlight, try to choose an isolated drive power supply. The parameter requirements of the LED are strict. When the drive power supply and the light source parameters are not matched, many problems will occur, such as excessive voltage and high current will accelerate LED light decays or even burns out.
Understand LED isolated drive power and non-isolated power
Heat dissipation performance
If the working temperature of the LED is too high, it will accelerate light decay and even dead light. The heat dissipation performance is mainly reflected in the design and production process of the lamp.
Try to choose a brand with strict production standards.
Diffusion board LED downlights generally use the acrylic diffuser, but acrylic is also divided into three or six-nine grades. Inferior acrylic has a poor light transmission and will turn yellow and become brittle under continuous temperature.
Luminous flux maintenance rate, commonly known as luminous decay LEDs will have varying degrees of luminous decay when they are continuously lit. The current international standard is L70, the luminous flux reaches 70% of the initial luminous flux, and the lighting time should be> 25000 hours. Professional lamps can hardly meet this standard.
Light effect
Color rendering index The ability of the light source to restore the color of the object itself, the color rendering index of daylight is Ra100, and the color rendering index of the LED downlight should be ≥Ra80
Glare is an important factor reflecting the comfort of lighting, the angle of the glare protection angle diagram S minimum range: 10-30°