Lightech brand, uv lamp in the systems used in water disinfection with ultraviolet, length: 436 mm power: 21 watt 4 pin maximum 50 pieces of this product can be ordered. swordslife reserves the right to cancel orders over 50 pieces. more than 10 stocks are offered to be sold at the campaign price. the seller determines the selling price of the product you have examined. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.