indicator MR16 is rated

 We use a common warm white LED lamp as a light source of the basic example. The LED indicator  MR16  is rated as 3000K CCT, 350mA, 3.8V maximum forward voltage drop. LED lights are classified according to the brightness logo, here we choose the smallest part of 60lm @ 350mA. Under the test conditions, LED junction temperature is 25 ℃, current pulse duration of action is 25ms. In the actual work process, LED junction temperature will be based on the thermal design effect lighting equipment up to a stable value. For any LED, as the temperature rise, which produces brightness will decline. Compared to the test value, operating at 60 ℃ the LED's brightness will be reduced by 10%. This means that the actual steady-state LED brightness produced size 54lm.

To achieve the desired lighting levels, we need at least 10 of this size LED, here we use 5 LED two rows parallel ways. Use Light Tech's LED-18W DC 700mA constant current source drive will be able to drive two rows of 350mA to the LED. Its efficiency was 80%, can produce an output voltage 24V.  T8 Tube 

By calculation, 10 work at 350mA, 3.8V LED under the total power consumption 13.3W. Therefore, the light source is equal to the energy efficiency of 54lm × 10 (ie, 540lm) divided by the total power consumption, too 41.5lm / W.  LED Flexi