Z-Power LED - Seoul Semiconductor
Z-Power LED's thermal management perform exceeds other power LED solutions. It incorporates state of the art SMD design and Thermal emission material. Z Power LED is ideal light sources for general illumination applications, custom designed solutions, automotive large LCD backlights.

Z-POWER LED Series Electrical Drive Management - PDF
" Why constant current? - LED is the component that allows current through itself according to input voltage. In other words, it is close to voltage control component. General LED, especially Z-POWER LED must be driven by constant current. There are two main reasons. Firstly, LED is an optical device. How much luminous flux we can get from LED is very important. Generally luminous flux is closely related to driving current. It is easy to recognize and control optical characteristics by current constant. Secondly, LED is more sensitive to voltage than current."
Seoul Semiconductor Co., Ltd is a Korean company manufacturing LED devices. The company is producing LED packages in two plants in Ansan, Korea.
Seoul Semiconductor Co. Ltd.
1B-25, 727, Wonsi-dong, Danwon-gu, Ansan-city, Gyeonggi-do, Korea 425-851