Seaya canister lights are the weapon of choice for most explorers and technical divers nowadays.
The lights are rugged and realiable, made in Poland by a manufacturer that does only lights. You can trust it to work flawlessly under the most extreme conditions.
The diver has a long list of customization options like:
the color of delrin that the canister is made of, color of the anodization of the light head, number of outputs, type of switches, power of the LEDs, sidemount or backmount config, quick connect or hardwired and more.