This is one of my slow projects that's been under the bench for a while waiting for inspiration and suitable parts to present themselves.. Shoehorning in the new electrics at the moment on account of Captain Nemo's original design using Sodium batteries having some issues. When done it will re-charge safely on USB and in an emergency can double up as a small powerbank for a cellphone. Next trick is make a downlight look like a bulkhead lamp....