I have one of my jars that I never turn off and it doesn't get hot. I think the "secret" might be the smaller the jar the fewer lights you want in it. I think my quart jars have about 10 lights or so in it. I have a gallon jar that I use a 25 light set. You do want them to get somewhat warm as that is what sets off the aroma from the potpurri on the inside. I also "refresh" my potpurri by adding scented oils to it when it doesn't have a aroma to it like it did at first. Good Luck!
