Insulating composite Roof lights Site assembled Double skin Roof lights Assembled on the Roof, this product comes in parts that are easy to handle and install. This is our most popular insulating Roof light system and provides a U value as low as 1.8 W/m²K Brochure Site assembled Triple skin Roof lights Assembled on the Roof, this product comes in parts that are easy to handle and install. This is our most insulating Roof light system and can provide a U value as low as 0.9 W/m²K Brochure Factory assembled Double skin Roof lights Assembled in house at our Factory, these Roof light systems provide a U value of 2.5 W/m²K Brochure Factory assembled Triple skin Roof lights Assembled in house at our Factory, these Roof light systems provide a U value of 1.8 W/m²K. Brochure