After much deliberation in costs and solutions to resolve our issues with a large 3.5m x 2.5m glass lantern, we chose to order a diy Lantern Lite blind from Skylightblinds. We are very pleased with the product they supplied, both in quality and service. We had a couple of technical glitches which were overcome by excellent support and fast delivery replacements . A fair level of engineering competence is needed for an installation of this size and we needed 3 people to lift and final fix. I have confidence in recommending this company and product. We have only had the blind up a couple of weeks so no knowledge of its winter thermal barrier performance but it certainly works as a sun shade.