Thanks for posting that. It got me thinking...

One thing I've noticed is that I think we're all (except bagginsball) using a ColorRamp with blue at the bottom and yellow/orange/white for the other three.

But the last screenshot I posted of a real flame (engineerguy's green candle), and also the flame of the red candle rightmost of the four real flames posted a bit earlier don't seem to show any blending of the blue colour - at any point the flame is either orange/yellow/white or it's blue.

So what should the fourth colour of the (and I'll use my version of the ColorRamp here) white-yellow-orange-??? be ? Since the area with the fourth colour is mostly transparent you could say that it doesn't matter, but it clearly does - using blue just doesn't look right to me.

How about black ? And while we're at it the orange and yellow look too saturated to me so change those too (orange = 255, 180, 120, yellow = 255, 235, 150 or something like that). Also delete all the lights in the scene.

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.