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Illumination & Displays

High-brightness ceiling lights use LED-based edge lighting

Global Lighting Technologies

Global Lighting Technologies (GLT) has combined its edge-lit LED light guide technology with extensive Far East mass production capabilities to create a new and improved troffer downlight that is more efficient (60 lm/W), brighter (2500 lumens), offers four different color temperatures, and uses fewer LEDs.

The new troffer downlight assembly is 24"/60cm square and approximately 0.43"/10.9mm thick and weighs 3.5kg. It is edge-lit using 100 LEDs, which represents a decrease of approximately 70% from previous versions. 50 LEDs are spaced along on each of two sides of the troffer assembly against the ultra-slim (3.5 mm thick) light guide, which uses advanced light extraction features to spread light across the troffer surface with perfect uniformity for bright, uniform illumination in a thinner form factor without hot spots or dark areas. Power consumption is only 40W, and the new troffer offers a high CRI (color rendering index) of =80.

Since LEDs contain no mercury, the edge-lit troffer is an environmentally friendly solution as well. It  reduces maintenance and power consumption and, when compared to a direct backlighting approach using LED arrays, minimizes thermal management issues as well as the number of LEDs required for efficient, uniform light dispersion.