getting a little more light out of those candles

This seems like it would do the trick without the glass:



http://amzn.to/2x5bHKu

Mirrors, a reflector behind your lantern or lamp, or crystals (lead glass) to pick up the light and sparkle, will all help boost the apparent light your candlepower is giving off. Years back with the lacemaking cottage industry and 'dame school' type learning, they would also fill beakers with water (round bottomed with a thin neck) and hang them on cords near the candle. The children would sit in rings on stools around the candle, the best would be in the front, and the slower and lesser skilled in the next few rows. The Palace of Versailles Hall of Mirrors was built on this premise, the chandeliers had crystals to catch the candlelight, and the mirrors reflected that light, making it bright within the hall.

Mirrors are our friends.  One mirror can 'double' the light output.

And, to make your candles last longer, store them in the freezer until ready to light.
This can give 20-50% longer burning time.

Save those glass pillars (saints type candles, you can get them plain clear) and put a taper in an empty one then stuff any drips or chunks (grate up) of already burned candles and fill the container tight packed. Keep the taper in the middle. When lit the wax will all melt into a solid and feed the wick for a lot longer burn time. Light again with a lit broom or grass straw, bamboo skewer, or piece of raw spaghetti.