Suitable for operation with conventional ballast or 230 V. The Philips Master LEDtubes T8 feature rotating end caps. They can be adjusted for optimal alignment at 0°, 22.5°, 45°, 67.5°, or 90° degrees. Benefit from longevity and energy efficiency: LEDs (light-emitting diodes) have the advantage over traditional light bulbs of not generating heat, instead converting most of the energy into light and thus consuming only a fraction of the electricity. Additionally, LED light sources are extremely durable and do not need to be replaced often. Since LEDs are flicker-free and have a high color rendering index, their light is always pleasant for your eyes. Objects illuminated by LED lighting appear in their true, natural colors.