T4 half spiral 
Features: 
* Compact electronic fluorescent lamp with high power and high luminance. 
* Energy loss is 80% less than that of incandescent lamp. 
* Power factor and harmonic distortion comply with IEC standard. 
* Not suitable for dimming or electronic switch circuit. 
* Never used in the ambient with water dripping or heavy humidity 
* More cap styles for choose (E14, E27, B15, B22). 
* Different color temperatures available: 2700K, 4000K, 6500K. 
* Longest life up to 10, 000Hrs.