Opal LED tube to replace traditional 18W fluorescent tubes, 9W 900lm, color temperature bright 4000K, G13 base, life approx. 25,000 h. Size ⌀ 26 x 590 mm. The LED tube comes with an LED starter (a short circuit switch). Turns on without delay immediately producing full luminosity even in sub-zero temperatures. Better quality of light than is produced by fluorescent tubes. Turns on without flickering. Continuous uniform spectrum, no color distortion. No UV or IR radiation. Does not contain mercury.