Coefficient of daylighting that can be transmitted through a glazing material, which includes the effects of dirt (denoted by Maintenance Factor). The higher the diffuse transmittance, the more daylight will pass through. This is affected by several factors; the number of glass panes in the assembly, coatings and the glazing type (clear or bronzed etc). Tinted glass can reflect a lot of light so that only 10% may pass through. Clear glass may allow 90% light through.