Your lighting doesn't really make sense. You've got a completely exposed bulb, so the most realistic light to choose is a light right at your model. If you had a directional light, it would make more sense to use a light_spot. The first picture seems more accurate but the whole thing should be much brighter; would even combine an env_glow or env_sprite with it as well.
Your second picture's lighting is probably equivalent to having a small desk lamp on the ceiling pointing straight down