Performance of LINIT U-profiled glass Transmission datas The light transmission varies for single glazing from 0.88 % to 91.5 %, for double glazing 0.50 % to 0.83 %. Also values of total solar energy gain can be achieved for single glazing in the range between 0.83 % and 0.88 %, for double glazing between 0.60 % and 0.80 %. Concerning the reflection of the UV-light transmission especially the perfor- mance of LINIT "klar" and the low iron LINIT "solar" is excellent. All the values for light transmittance and total solar energy gain may deviate within the usual tolerance limits for cast glass. Optimized solar energy utilisation LINIT U-profiled glass inherently provides high light transmission values of up to 88 %, thanks to its high-quality low-iron content raw materials. LINIT "solar", which is manufactured in a special production process, has an even more highly optimised raw material composition and energy-optimised surface structure, which allows for a higher degree of light transmission to be achieved, of about 91.5 %, and a higher total solar transmission value of about 88 %. Independently of these improved energy advances, this special glass can also be produced in another variant, capable of reflecting a high proportion of chemically-effective UV radiation, which in many contexts is regarded as potentially harmful. The LINIT TWD System, as an ecologically attractive and efficient solar con- cept, combines the high-performing low iron LINIT "solar" special U-profiled glass with efficient and aesthetically transparent thermal insulating materials. All the values for light transmittance and total solar energy gain may deviate within the usual tolerance limits for cast glass.