Colour Temperature (K)

  • Colour temperature indicates whether a light source is ‘warm’, ‘cool’ or a ‘neutral’ blend of white, as indicated by the correlated colour temperature or (CCT). Lamps with a warmer appearance normally have a CTT of 2700-3000 Kelvin. Warmer lights are considered more appropriate for domestic settings, transversely cooler lamps might be around 6000k. Cooler light is more often used in offices and shops due to the ‘cooler’ appearance. Neutral white, around 4800-5600K is used for backlighting due to the purity of white.

CRI Colour Rendering Index (CRI)

  • Short for colour-rendering index, CRI is the ability of a light source to show the colours of objects accurately. The higher the CRI, on a 0-100 scale, the more accurately the lamp will render colours. Lamps with poor colour render will distort some colours. At Bright Green Technology we aim to ensure all of our LED’s offer consistency and high colour rendering.


  • The Digital Addressable Lighting Interface is a protocol for lighting control and dimming agreed by major manufacturers & institutions. This controls standard is set out in the technical standard IEC 62386. A DALI device can manage up to 64 devices, on a standalone system via bi directional data exchange. DALI connections can also be processed in a group to increase the number of devices available to control.



  • Short for passive infrared. PIR sensors are electric sensors that measure infrared light radiating from objects in their field of view. They can detect heat from object that are undetectable by humans. PIR sensors are one of the main technologies used for presence & absence detection, such as security lights or commercial lighting, turning lights off when spaces are not used or manned.  

IP Rating

  • An IP (index of protection) rating tells you the amount of protection a luminaire or other piece of equipment has against things getting in, including dust, dirt & water in addition to dirt from hands and fingers.


  • Lux is the international unit of illumination. A measure of how much luminous flux (in lumens) is spread over a given area (in square metres). In other words, it tells you how much light is hitting a surface. 1lm/m2, equals 1lx.