A:Answer there are 2 main differences from what I can see. the most obvious is the Optoma UHD51ALV is rated at 3,000 lumens vs. 2,400 for the UHD51A. in Optoma literature, the "LV" in the model number stands for lights on viewing. the other difference that I can see is the color wheel on UHD51ALV is utilizing RGBWRGBW type, while UHD51A shows RGBRGB color wheel.