This is the best I'm able to do with the lampshade with my present knowledge and perhaps Poser's present ability. This is with the Ambient Color hooked up to the texture map. It's still not right, but....

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3