This is a continuous lighting bulb with a color temperature of 5500k and output of 135w pure white daylight. it has no noise and no flicker. it is also compact and easy set up, operating in low temperature and has a life span of up to 10000 hours thereby making it ideal and fit for digital camera photography. additionally, it has a long life energy saving feature that is equivalent to 600w incandescent light per bulb with 220v~240v energy.