This gives you a lumen rating of 6,300 per fixture. Four such bulbs close together illuminating the same area is (roughly) 4*2710 = 10840 foot-candles (again...per square foot). A common T8 bulb is the F32T8 which uses 32 Watts of power. LED Lamp —— 90 to 100 lumens /watt. Multiply 3,150 by 2 to achieve the lumen rating for one fluorescent light fixture with two 40-watt bulbs (3,150 is the standard lumens for one fluorescent tube). T8 light bulbs come in a wide assortment of lengths and wattages and can help cut your electric bill up to 40 percent versus using older T12 type bulbs. Extended performance compared to 800 series T8 lamps with up to 42,000 hours life at 12 hours/start and 94% lumen maintenance. Divide the total lumens needed (60,480) by 6,300 to get the number of fixtures you need, in this case 9.6. So, 2710 lumens (per square foot) is 2710 foot-candles. In the past few years, we’ve seen many light bulb phase-outs aimed at removing inefficient incandescent and fluorescent bulbs. Output 129 lumens /watt. Prior to the Energy Independence and Security Act of 2007, the definition of general service fluorescent lamps (GSFL) excluded lamps with a CRI of 82 or greater. For fluorescent bulbs, the number after F tells you how many Watts; a F17T8 is a 17 Watt fluorescent T8 lamp. T8 lights are commonly used in larger spaces as overhead lighting for example in office spaces, garages or classrooms. LED REPLACEMENTS FOR FOUR-FOOT LINEAR FLUORESCENT LAMPS 3 CLEAN CITIES 3 The Consortium for Energy Efficiency (CEE) specifications for T8 fluorescent lamps require a CRI of 80 or greater. We’ve also seen companies rolling out newer, more efficient bulbs and lamps such as LED T8s.Overall, the lighting industry and civilization itself are progressing toward lighting being as energy efficient as possible. In other words when you put up a LED fixture such as a 45w 2'x2' against a 3 bulb T8 fluorescent 2'x4', the LED will win every time.....and use a … One foot-candle is equal to one lumen per square foot. This is why you will often see long T8 fluorescent lighting in 4 foot light tubes, 6 feet and 8 feet long. Apparently one such bulb produces 2710 lumens. F32T8 Bulbs - Linear Fluorescent Tubes . S.V. T8 lights are commonly used in larger spaces as overhead lighting for example in office spaces, garages or classrooms. According to the IESNA Lighting Handbook: (Illuminating Engineering Society of North America) published in 1993, here are some lumens required per square foot. Hope this helps. Four such bulbs close together illuminating the same area is (roughly) 4*2710 = 10840 foot-candles (again...per square foot). Let us help you out mathematically. Do you have enough lights? At Bulbs.com you can purchase over 20 different Fluorescent Bulbs from Sylvania. led replacements for four-foot linear fluorescent lamps 3 CLEAN CITIES 3 The Consortium for Energy Efficiency (CEE) specifications for T8 fluorescent lamps require a CRI of 80 or greater.