Well if this is multiple choice then tell me but other than that I can tell you what I personally think. Think of a fire, a fire might get bigger when it is hotter and it can even change colors but most of the time it does not get much brighter once it reaches a steady burn. Stars are kinda similar they can be big but not bright and vice versa. dwarf stars are a tad bit different but then again I will remind you that I am not professionally educated on this topic. the properties that determine such a star can be density, heat(of course), and chemical makeup. Density plays the largest role in such a situation because if the star is not dense but is made of a very hot material then a lot of the time it will be dim where if it is highly dense with a very hot material then often times they are very bright. I don't know if this helped but I hope for your case it did ^-^ I gave it my all XD.
