Fig. 6.

Power output as a function of forward voltage. The effect of varying the forward voltage or intensity (%) on light power output was assessed in the same device connected to three fully charged batteries of different recharge cycles. The data are shown as the total power output (a) and irradiance (b) and show that power output was reduced by 3% if the forward voltage is reduced by 40%. Across all voltages, the battery with fewer recharge cycles (1) had a higher power output compared to batteries with more recharge cycles (2, 3) but all batteries showed the same % reduction with a decrease in forward voltage.