Light Abbreviations and Acronyms
-   WPEWall-Plug Efficiency
-   WSWalter Schrickel
-   WTWhite Track
-   WWWet White
-   XALXenon Architectural Lighting
-   XHLXenon-Halogen Lamp
-   YAMYttrium Anuminum Monoclinic
-   YCDYocoocandela
-   YPFYield Photon Flux
-   ZCDZeptocandela
-   ZCDZettacandela
-   ZPZone Plate
-   ZPALZone-Plate-Array Lithography
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