You are very good with the technicals. I love the mono-chromatic color used here. The detail is superb and this would make a terrific product placement shot.
I think we should create blue light districts throughout the world just to provide a place for people to use this bulb. Wonderful, subtle shades of blue with lighting to die for and a perfectly chosen depth of field. Delightful.
I like the shape, detail, and color. I'm not sure if more DOF would have helped. I keep wanting to see the specular highlights on the top of the bulb in focus, but I like the shallow DOF on the filament. So...I don't think I've said anything useful here. Moving right along....