If you look through the threads you'll find more in depth info....but in short...the clear lense is already present in the mystique lamps. The contour lamp uses a red lense with fluting to filter the light and spread it properly...it's all in the one lense. The mystique lamp looks different and is set up different...it uses a clear lense with fluting to first spread the light and send it where it needs to be sent, then a few mm's after, there is a seperate thin red lense of uniform thickness that filters the light leaving only the red that you see.
So basically on the stiques, you can remove that outer red lense, to expose the clear lense....but now there is an open gap that needs to be sealed to make the lamps weatherproof.