Mains operation or with ballast: G10q LED tube SubstiTUBE in ring shape, 11 W, 6,500 KThe LED tube lamp SubstiTUBE in ring shape is suitable for operation with electromagnetic ballasts (CCG/VCG) as well as for direct use with mains voltage. It serves as a replacement for conventional T9 fluorescent tubes and requires up to 50% less energy in comparison. Replacement is quick and easy, without rewiring. It can also be used at low temperatures and has a very good switching resistance (200,000 switching operations).Technical features:- Operation with electromagnetic ballasts (CCG/VCG) or directly via mains voltage- Daylight white light colour: 6,500 K- Luminous flux: 1.320 lm- Comparative value: 22 W- Supply voltage: 220 - 240 V- Operating frequency: 50/60 Hz- Temperature range: -20 to 45 °C- Low flicker according to EU 2019/2020 (SVM ≤0.4 / PstLM ≤ 1)Special features:- Simple and quick replacement of conventional T9 lamps without rewiring- Average service life: 30,000 hours- Very good switching stability (200,000 switching operations)- Good luminous efficacy: 120 lm/W