The UV resin requires a high dose of concentrated UV light to cure, it will not cure in normal sunlight. As well as a light box, it is also a good idea to leave the resin to sit (out of the UV box) for a couple of minutes after curing, as sometimes the heat from the box seems to inhibit the curing. This is a high-quality lamp from the Daylight Company. This is a professional UV light unit, primarily sold as a nail gel curing light. When I researched UV light I found one that looked very similar to this on eBay, for a much lower price. Sadly it failed half-way through my first curing, and I could never get hold of the seller. It was an expensive lesson. The light has a large front opening slot, where you simply slide in your pieces. The bottom and sides are covered in reflective material to help with even curing. However, I still think that creating a little "nest" of crinkled up aluminium foil at the bottom of the unit, helps to reflect light from all angles, which speeds up curing. The box has two timer settings, 90 and 150 seconds. The curing time depends on the thickness of the resin. As a guide I would use about 300 seconds for clear gel, and probably at least double if I've added colour. Leave the piece to set after curing for a couple of minutes. If the light gets hot it can inhibit curing, so turn the light off and let it cool off in between curings. This UV lamp comes with 4 high-quality 9W UV light tubes. Simple and clean design, with a white cover. Comes with a 12 month manufacturers guarantee. New UV tubes are easy to get in the UK. NOTE: UV Boxes generates very strong ultraviolet light, it is important to not look into the light as it may damage your eyes