The main differences between the Lenovo Q24I-1L and Lenovo L24I-30 monitors lie in their specific features and product lines. While both monitors typically offer a 24-inch screen size and Full HD (1920 x 1080) resolution, they may have variations in design aesthetics, connectivity options, and additional features. The L24I-30 is part of Lenovo's L series, which often includes a slim design and various connectivity options. The Q24I-1L might have different design aesthetics or additional technologies like integrated speakers or eye-care features.