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Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage, the tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. [7] This first energy-saving tube design remains a T12 tube even today.
T5 retrofit conversion is a means of converting light fittings designed to use T8 format lamps, so that they can use more energy-efficient T5 lamps. [1] This is done by electronically converting the luminaires to high frequency operation.
Fluorescent lamp efficacy is dependent on lamp temperature at the coldest part of the lamp. In T8 lamps this is in the center of the tube. In T5 lamps this is at the end of the tube with the text stamped on it. The ideal temperature for a T8 lamp is 25 °C (77 °F) while the T5 lamp is ideally at 35 °C (95 °F).
T20 size ANSI № 7440 WY21W WX3×16d 1 12 V: 21 W Amber ANSI № 7440NA WP21W WY2.5×16d 1 12 V: 21 W WPY21W WZ2.5×16d 1 12 V: 21 W Amber W21/5W W3×16q 2 12 V: 21 / 5 W T20 size ANSI № 7443 WR21/5W WY3×16q 2 12 V: 21 / 5 W Red
Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.
6V6S – A modern production, large plated tube, heater current 500mA, with a higher plate and screen voltage rating. Made by JJ Electronic. 6V6GT(A)(B)-STR – Modern production valve, STR signifying "Special Test Requirement." Claiming to be heavy duty, suitable for high plate voltage. Military specification 6V6 tubes and their equivalents