Most light bulbs do not look like this anymore so when you find one its good to take a picture no matter what the condition of it is. This light bulb has a bunch of scratches all over it so that's what the marks are but that is not what you should be focusing on anyway you should be focusing on the element inside the bulb itself, but i'm not really one to tell you what to do so just look at whatever part of the picture you want.
Photography blog