I think the light output is a bit like our refrigeration expectations nowadays. When we lived without electricity he light from one of these would have beaten a candle by tons, better than a campfire. Imagine people having to live without electricity, having a coolgardie safe only no to keep their food, and maybe an underground cellar.
hey Willie, do your geckos make audible sounds. We ha geckos all over a villa in the Maldives that called to each other all night. Never heard lizards making any thing other than hisses when threatened.