Linking light and shadow gives this image a higher meaning. Very well executed. Although the bulb isn't on, it is very well lit and the shadow is great.
Good toning, I really like the shade of blue you chose. The shadow within a shadow also adds impact to your image. The lighting is very good, just under the blown out phase at the top of the light bulb. The transgression in the background from blue to black is not hard and abrupt, rather soft and easy. Not much too critique on here.
One of my favorites in the challenge. I like very much the highlight on the top of the bulb, the clean disappearing 'horizon' line, and the centered composition.