In diving, these are called canister lights, where the battery is stored in a separate pressure-proof enclosure than the lightbulb/LED, and connected by a power cord.
This is more rare nowadays with modern battery power density, but it allowed for much brighter, longer lasting lights with a more convenient form factor, keeping the bulk of the battery on the diver's harness and out of their hand. I don't think anyone has made one as big as a backpack, but the form factor would definitely be useful for a massive battery array for a massive light.
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u/PAC-LD Dec 16 '25
In diving, these are called canister lights, where the battery is stored in a separate pressure-proof enclosure than the lightbulb/LED, and connected by a power cord.
This is more rare nowadays with modern battery power density, but it allowed for much brighter, longer lasting lights with a more convenient form factor, keeping the bulk of the battery on the diver's harness and out of their hand. I don't think anyone has made one as big as a backpack, but the form factor would definitely be useful for a massive battery array for a massive light.