21W fluorescent lamps are made in the workshop. Some friends may ask, why do we have to make 21W fluorescent lamps, and not all 18W on the market? Because our company has its own R & D team and its own workshop factory, we can customize all the parameters of the fluorescent lamp. As long as you have a request, we will meet you. To truly serve customers, this 21W is custom-made, with high brightness and customer satisfaction.