Hologen & LED Pond Light Transformers for all your lighting needs. We stock a nice selection of low-voltage pond light transformers to run your pond lighting system(s). We have transformers with digital timers or transformers with “Photo Cell” capabilities. The “Photo Cell” is a nice feature because the transformer can sense when it is light & dark. The Photo Cell automatically turns your underwater lighting system on and off according to the light outside. If you plan to mount your transformer in a shady area on your property then the Digital Transformer might be a better choice for you.