Madmole,
I love the aesthetics of the torch and candle but as of right now it's counter intuitive to use a bunch of them because of heat and screamers. I'm not gonna suggest remove heat from them but make a book series or schematic to remove heat from them or recipe for "survival torches/candles" that produce no heat.
The book series could be small footprint or something and each book would remove heat from small producers and slash the amount of large producers, like forges.
For me it's an aesthetic choice. Some play throughs I'll go electric lighting, others I go for that Dracula castle feel.
Just something to consider if you want to make more schematics or books.