First, the choice of LED lamp beads. Second, LED lamp beads work environment temperature. Third, the LED lamp beads operating electrical parameters plan. To sum up, the LED lamp beads of the electrical parameters of the plan should be based on the actual environment, if the lamp's thermal conductivity is very good, the LED white lamp drive current is not a good one, due to the LED lamp beads birth occurred The heat can be exported to the surface without damage to the LED, which is the best protection for the LED. On the contrary, if the thermal conductivity of the lamp is to be put to good use, it is better to plan the circuit smaller and let it put less calories out.