Forget everything you've heard and seen about fluorescent lamps. While you and I were sleeping, technology has leapfrogged over every other lighting technology. Every fault that fluorescent lights had has been addressed with these lights. Such as buzzing ballasts, flickering when turned on and in cold conditions, ease of installation and poor color rendering. 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. Now for the best part: the color temperature is 5000 degrees Kelvin which is equivalent to natural light! The six T8 fluorescent lamps produce 21,246 lumen even when mounted to a 9 foot ceiling this fixture produces over 150 foot-candles of light on a 42" high bench! This is way over my standard of 100 foot-candles for a work environment. 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. A far cry to the flatness and low color temperature of a typical fluorescent bulb. Hang it anywhere you want awesome light and plug it in. Slip-fit cable mounting system for easy installation and adjustment. The lightweight corrosion resistant aluminum alloy housing gives a total weight of only 16 lbs. 6 Tube Fixture measures 48 1/4" x 26 1/2" x 3 5/16" and 4 Tube Fixture measures 48 1/4" x 18 1/2" x 3 5/16". Uses an included 110V grounded power cord for use with standard household outlets. Wonderfully made in the U.S.A.