LED power supply usually has constant current output and constant voltage output. Constant current output was once the normal mode of LED emergency power supply, and now the mainstream output mode has been upgraded to constant power mode.

The biggest advantage of the constant power mode is that it can self-adjust to suit different load's voltages, and we make the output voltage range very wide (10-60V, 60-300V), so that our emergency power supplies are extremely versatile.

Benefit from the constant power output mode, we can advise a quick calculation of emergency output. Taking the 3 hours emergency duration as an example, a single 26650 cell (or 2 18650 cells) can provide about 2W emergency power (approximately equivalent to 250lm output).