I was disappointed that the colors in the glass turtleback shade, when lit, are not nearly as bright or vibrant as those shown in the photo. I used a 15-watt bulb, which the manufacturer specified as maximum wattage safe to use. There is no yellow and little green glass...it’s mostly all blue glass.

it mostly shines down not up into shell

I am very happy with this lamp, it looks exactly as pictured. very interesting piece.

Just what I wanted.