Lee's Congo Blue looks like black light when used with a fluorescent source. Great effect colour. Very saturated.

LEE High Temperature (HT) lighting filter utilises both a different base material and surface coating to withstand hot light sources such as focussed spots or large fresnels. HT products have the same colour properties as standard gels but are less likely to hole or burn through in extreme conditions. All standard colours that are high heat absorbers are available in the HT range, as well as a selection of other popular colours within the colour effect range.