Getting old ain't for sissies. I'm finding I need brighter and brighter light to read and work on my projects. These are the same as the professional, high quality tri-phosphor, 5000 degrees Kelvin fluorescent 6-Tube Lights that we sell, but in a compact, twin tube design. These lights operate with an electronic (solid state) ballast to eliminate buzzing. Turn on the light, and they come on in an instant, like an incandescent bulb. You'll also see true color, and your eyes won't be straining to see any project you're working on. The difference about these bulbs is all in the powdered phosphors used to coat the inside of the tube. This coating transforms the ultraviolet radiation into visible light. By combining different phosphors in varying proportions, it's possible to produce lamps in a wide variety of colors. Tri-phosphor is a blend of 3 expensive narrow band rare earth phosphors (red, blue and green) used to help improve color rendition, color preference and improve light output. The lightweight corrosion resistant aluminum housing is easy to install and the 8 foot cord can be plugged in anywhere. Includes slip-fit steel-wire hanging system for up to a 10' drop with mounting hardware for studs. A far superior alternative to your typical, and very marginal, fluorescent shop lights found at your local home center. Do yourself a favor and enjoy less eye strain and better vision today! 48 1/4" x 10" x 3 5/16". Wonderfully made in the U.S.A.