Size of Candles for spells

I am wondering what size candles I should use for rituals and spells that would be on just my altar, which can be used as a candleboard. The altar is about 24" square, and candle holders are tricky to size. I am thinking either chime candles or regular type 12" candles. Do you guys think that regular candles are overkill for altar work? They do look more impressive that the chime candles though.
Thanks in advance,

Honestly, size of the candles does not matter for most types of workings (the exception would be those that have you light the same candle over a series of days). Use whatever works for you and looks appealing. In my experience, it is best not to over clutter your altar so you have room to work on and have no risk of a fire hazard, but it is up to you.