Marks 21, are your propane lamp fixtures made by Humphrey? If so, they will never be as bright as a Coleman lantern, but with the correct mantle, gas pressure and air/fuel ratio much brighter than any wick-type kerosene lamp. Great in the winter when you want both light and heat.

https://gas-lights.com/mantles/indo...2-paulin-falk-3769-preformed-mantle.html