Do the luminaries get smokey or black on the inside from the candle?
We use a good quality unscented candle made in the U.S. or Canada in our luminaries and have no problems with them smoking up. We have in the past bought cheap candles and found that some can smoke pretty badly. Scented candles are made with oils which may cause smoke to be given off. If your luminary should get smokey it is not a problem, they are high fired stoneware and can be washed, water or detergent will not hurt them. Sometimes a toothbrush may be helpful to get into small crevices. If your candles do smoke or aren’t as bright as you think they should be try a different brand.