Without Carrara here at work I have to do this from memory, so if one of my instructions is wrong, please forgive me. I used bulb lights for the candles, and on the properties tray on the right select the light in question from the dropdown list. Next go to the 4th tab (I forgot what it's called) with the sorta star looking icon. That tab has all of the options for the lighting effects, including light sphere. There will be an edit button, and I think an activate checkbox.