I made another candle model (the table candle's flame is down in the melt pocket and so not visible from the side).  It has an unseen (does not cast shadows, not visible in camera) emitter mesh closely fitted inside the flame mesh.  The flame can be given modest ambient so that it doesn't white out, while the emitter has an ambient value of 256.  This is a Firefly IDL render;  note that it casts a reasonable amount of light (there is no point light used).  As @hborre noted, this takes much longer to get a clean render, and Firefly IDL is notorious for the splotchy lighting;  I would instead use a point light (scaled to fit the flame) for a single candle, but the method is great for an array of hundreds of lights where using Poser lights would be prohibitive.

BB's flame material, modified for dual root - the Superfly material adds the highlighted nodes which jack up the lightcasting output:

Flame prop properties:

Unseen flame emitter prop (for Firefly IDL use) properties:

This is where I *do* recommend use of mesh lighting:  lots of lamps in the elvish tree stairways (and the pixie dust trail):

...or odd complex shapes, such as the tubular neon of Xanadu:

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5