The Arcadia Ultra Seal controller features new ULTRA SEAL waterproof (IP67) lamp holders. Taking the extremely popular fluorescent controller, Arcadia has now developed new ULTRA SEAL lamp holders to ensure that this product complies with new lighting safety requirements and to provide a greater flexibility for positioning the product by the use of longer lamp leads. Featuring a uniquely designed lamp holder ring design, which is totally waterproof. 1) There is no requirement for a starter switch or choke, as there is in the traditional form. These starters have a limited life-span, and do require replacing periodically. 2) They are much more energy efficient. A traditional ballast wastes a considerable amount of the energy input into it, in the form of heat. This can be noticeably felt by placing a hand on a controller that has been running for a while. In the case of the electronic controller, there is very little wastage through heat. Instead the majority of the energy that comes from the ballast is converted into light from the fluorescent tube. 3) There is no flicker effect. A fluorescent tube lit by a traditional ballast, is not actually producing a constant light output. Instead, the light pulses at a rate that we cannot see, and so to the human eye the light is constant. The eyes of some species are much more sensitive than humans, and can actually perceive this rapid pulsing of light. Reduced main lead to 50cm to increase safety Designed to make lamp changing simple Comes complete with universal mounting bracket for ease of installation GS and CE approved for additional safety