Hi Tanvir:
Also please check out our MP4026 to design a Constant Current Output Flyback instead of a 37V Constant Voltage Flyback and then using a series resistor to control the current. If you use the MP4026 based Flyback then your current will be controlled by a regulation loop on the primary side and this constant current control will be much more precise than what the resistor with 1V drop will offer you. Also this will increase your overall efficiency. Please consider designing your flyback with the MP4026 as a Constant current Output flyback.