Word of warning. We bought a copy of the Wheems & Plath miners lamp a year or so back and ended up throwing it away. Adjusting the thing was a major nightmare unless it was dead cold and refilling the thing was very messy indeed.
I am not saying that these are the same as the one we bought but be a little bit careful.
“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett, Nation