Color temperature plays a big role in accurate lighting for emission values. The default value is a base 'daylight' value. Higher values are bluer, lower values are down into the yellow-red wavelengths. As a rule, fire and incandescent bulbs should be well into the red wavelengths. That light in the render above looks pretty close to the sodium lamp on the path next to my window. The bulb has a distinct yellow amber color, but the light is more of an orange. You'll need to read up on the various emission values. Especially lumens and color temperature. These lights are based on real world models and will act a lot different than standard 3Delight or Firefly lights. Base color does not come into play in emission lighting. That's covered by color temperature. You can leave it at the default value and use image maps. This works well for screens, displays, signs and whatnot. Basically, for a better orange value, turn color temp down more.