LT is the percentage of incident visible light directly transmitted through the unit.
UV is the percentage of incident ultraviolet light directly transmitted through the unit.
SC is a measure of the heat gain through the unit from solar radiation. Specifically it is the ratio between the solar heat gain for the particular configuration and that of 3mm clear glass. A lower figure indicates better performance.
U value summer is a measure of the heat gain through the unit due to the difference in temperature between the outside and the inside A lower figure indicates better insulating performance.
RHG is the total heat gain through a unit for a specific set of conditions and takes into account both the solar heat gain (SC) and the conductive heat gain (Usummer ). The lower the figure the better the thermal insulating performance.