Do I love these types of photo's or not? Do I want to stretch the brain at this advanced age? Would a light bulb lit weigh more than a light bulb off? Is the glass half full or half empty? My guess might be that the lit bulb is heavier because it is full of energy thus heavier; although it might be lighter because the electricity activates the bulb and lifts it off its base momentarily causing it to weigh less.
Of course you understand that I am a moron when it comes to anything scientific and mathematics and....well that is enough confessing. Enjoy the photo.