The
          OPR-SF Series is an ultra high brightness ring light that offers 2.5
          times the brightness as the OPR Series. These ring lights come in
          white and has built in temperature sensors. This temperature
          protection circuit ensures the device will automatically shut off if
          the operating temperature increases and is not optimal. 
        
    There
          is no need for a strobe controller as the longer illumination times
          make it possible for illumination times of 1 ms or longer. This
          feature allows use with slow shutter speeds without making severe
          timing adjustments.