Delfa can manufacture color glass and band-pass filter glass with different sizes.
1. Color glass
Ø Cut-off glass: (Ultraviolet glass, Golden (yellow) glass, Orange glass, Red glass, Infrared transmission, Visible and Absorb glass)
Ø Selective Absorb Glass: (Violet glass, Cyanine glass, Green glass、Red glass, Infrared transmission, Visible and Absorb glass, Adiabatic glass, Sky-light glass, Rising color temperature glass, Falling color temperature glass)
2. Band-Pass Filter Glass
This kind of glass only transmits the light within a narrow wavelength range as shown in figure. The spectral characteristic is composed of maximum transmissivity (TM), wavelength of the peak (λM) , shortwave-cut-off wavelength, longwave-cut-off wavelength, and half-peak width.
The wavelength corresponding to the half of the maximum transmissivity is (λ2) and (λ1). And the half-peak width is determined by (λ2-λ1). Shortwave (longwave)-cut-off wavelength is corresponding to the wavelength of “zero” transmissivity. But there are a few types which transmissivities of the longwave-cut-off wavelength can’t approach to zero, then they are determined by the transmissivity of the certain wavelength.