Dear Witold Wojcik, Good day ! This is jasmine from Shenzhn hiso-tech which in the line of manufacturing and wholesaling LED light for more than 5 years. I know you want to market led panel light. And this model is the advantage and main product from our company, we can provide you with the high quality and best price. If you are interested in these products, just contact with me anytime if possible. Best regards, Jasmine Shenzhen Hiso Technology Co.,Ltd http://hiso-tech.en.alibaba.com. E-mail: jasmine@hiso-tech.com hisoled-jasmine@hotmail.com Tel: 86-755-26891896 Fax: 86-755-26689654 Skype: Jasmine Hiso