2ft, 4ft, and 8ft are the various sizes of LED Tubes available in the market. These can be installed in any of these three segments, i.e., residential, industrial, and commercial. But in the arena of industrial and commercial lighting, the T8 LED Bulbs 6500K have grabbed the market's full attention. T8 LED Bulbs 6500K are available in various wattages and Lumen Output. A different set of choices may confuse you, so better to go for a photometric analysis before installing an 8ft LED tube than only consider any of the options.