Here's a render in Lux render. I didn't optimize the geometry right on export so there is some faceting visible on the bulb and base.

All of these images are created using a single render in Luxrender. I created each bulb and set each light to be it's own Light Group. In Lux, you can then change the amount of light gain for each light group during the render at any time. Luxrender is an unbiased renderer, which means that it can produce realistic images at the tradeoff of time. The render never finishes but slowly converges on the correct physical solution. You just watch it until you are happy with the quality of the image and then stop the render.

I let this run overnight and then stopped the render. I then adjusted the gain of each light group to show the effect of each bulb on the scene. You can also change the color of the each light on the fly in Luxrender as well.

This is what I'll be showing in more detail in the tutorial along with the general use of Blender.