Low-pressure mercury discharge lamps with a tubular 16 mm envelope.  40% thinner than TL-D lamps High lamp efficacies up to 104 lm/W Highly efficient 3-band fluorescent coating in combination with precoating Specifically designed for operation with electronic gear and well suited for dimming Maximum light output reached at approx. 35 °C in free-burning position if an electronic ballast without additional electrode heating is used Can be ignited from -15 to +50 °C 16mm Diameter 28 Watt High Efficiency HE 1149mm