Gel filters have a strong history in theatrical application, however dichroic filters have become the preferred method of producing color from a white light source, especially in permanent architectural applications.

DICHROIC FILTERS

GEL FILTERS

Gel filters are very simple to use, are very thin (about 0.003” – 0.09mm). Their color is uniform and independent of the angle/beam of the luminaire’s optics. Made out of polycarbonate, polyester or other heat-resistant plastics, gels absorb heat and have the potential of fading quite rapidly.

Dichroic filters are made of borosilicate glass, thicker than gel (typically 2-3mm) and have much better filtering characteristics than conventional filters. Saturation is superior as the fabrication process allows for specific light frequencies pass. Since dichroic filters reflect frequencies that do not pass, energy (or heat) is not absorbed which allows for superior longevity.

While gel color remains consistent at various angles of light transmission, dichroic shifts color which is often not desired in lighting applications. Below shows how accessories and type of fixtures can prevent color shift:

Check with your local Zaniboni Lighting representative for more information.