One of the things I've noticed is that certain people get addicted to candles. They burn multiple candles continuously in their home. Before one candle goes out they light a back-up candle to take it's place. Usually it's the 7 day candles or vigil candles that people get obsessed with.
Now, I'm not going to tell people what to do. However, I have personaly found with my practice that if you allow yourself to get into that pattern of addiction then you are not going to see success. For one, you just don't light a candle and walk away. You have to work that candle. When you are constantly burning multiple candles in your home and burning candles back to back then you are going to eventually get burned out on it. You will not be putting as much energy into the candles as you did in the past and on top of that you are creating a fire hazard in your home.
Candles are powerful. However, please realize that candles aren not the be-all of the practice. Remember that saying, "lay you trick, walk away and don't look back". That can't take place if you are constantly burning them back to back.
If you feel like you are becoming addicted to candles in a negative way then please try doing works without them. Candles are great but you don't actually need them to produce effective conjure work.