Bulbs
Burning bulbs may be represented in several ways. Most simply, turn on the surface brightness. However, if the light emitting axis is inside the bulb, any shadow casting light will be trapped within during a trace. Setting the fog length to something small like .01 will then allow the light out while also flattening the bulb's silhouette. If You wish to fake the glare of light visible when looking at a bulb, You may wish to move the axis just outside the bulb. Then color the bulb a pale grey and turn specularity all the way up. This will make a maximum intensity glint which shades rapidly off towards the bulb's sides.
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