You realize the original post was from 2007, before better Firefly settings and Superfly rendering.  If you are truly interested in achieving a true PBR incandescent bulb, it would be better to attach a Blackbody node to the Emission connector and adjust the temperature (Kelvin degrees temperature).  Any value below 5000 will give off a warmer emission tint, above 5000 will appear bluish or cooler in emission.  Also, turn the Color chip to Black rather than matching the tint on the Emission chip, otherwise, you will be multiplying the Emission with the color chip.