Optics made by ECOGLASS are able to suppress UV light and blue light spectrum

LED light sources used to illuminate public spaces or work environments may emit a portion of their light in the UV or blue regions of the spectrum. When people are in the lit-up area, this emission becomes undesirable. ECOGLASS can add a filtering layer to their glass optics, completely suppressing or significantly lowering this unwanted emission.

Unwanted spectral regions are filtered out by applying a color filter to the surface of our optics. The filter layer absorbs portions of the blue light emitted by LED light sources. This results in a change in the light’s color temperature and a shift towards the yellow region. The filtering layer used reduces the total luminous flux by approximately 3-5%, which is significantly lower reduction than typically achieved by conventional color filters.

The optics is coated by the layer based on the “sol-gel” method. Thin sol-gel layers offer outstanding optical, mechanical and chemical properties. Such layer is technically another thin layer of glassy structure; therefore, the durability and hardness of the layer is similar to bulk glass.

As an example, the spectral emission of LED Citizen series CLU48 with color temperature of 2700 K is shown. The graph shows that, by applying above mentioned layer, a substantial reduction is obtained in the emission in the blue region around 450 nm while not lowering the optical performance in the remaining parts of the visible spectrum.