The sticker that states the Generation of the light engine and the contrast ratio is located on the bottom left of the pedistal. It is a big blue sticker. The difference is the 3rd generation light engine and a 1500 to 1 contrast ratio.
The newer 5085W should have the 4th generation light engine and a 2500 to 1 contrast ratio.
If you call Samsung and give them your serial number they will be able to tell you what generation the light engine is . Also there is a function on a Samsung Tech's universal remote that will display Ver 3 or Ver 4.
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