Two methods you could use, first is a point light positioned central to the flame, the second is turning the actual flame into an emissive if it's separate to the candle. For this you can iRay uber base the flame then place the flame image in the emissive colour channel in the surfaces tab, reduce the temperature to 0 so it doesn't affect the colour of the emission and play with the lumen settings.
Is there actual geometry for the flame? A plane or two with transmap or a 3d shape? If not you could use a stretched sphere or cone along with the info above from KA1.
Comments
Is there actual geometry for the flame? A plane or two with transmap or a 3d shape? If not you could use a stretched sphere or cone along with the info above from KA1.