I know that some turners like to strap a fiber optic light pipe to their hollowing tool so they can see what's going on inside a hollow vessle. On the off chance that one or more such folks are around this NG, here is a link to a suitable light source to illuminate a fiber light pipe - perhaps it's of inerest to you - inside is a power supply, a muffin fan, and a halogen type reflector light (in case you are thinking this could be parts for some other project)
here's the link
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