What is a DC-DC converter and why does the StenLight have one?
A DC-DC converter directly converts a direct current (DC) voltage to a different voltage, without converting it to alternating current or using a transformer. Most DC-DC converters can use an inductor to store energy in a magnetic field during voltage conversion. “Switched capacitor” converters use a bank of capacitors to store it in an electric field instead, but they are less efficient and can’t handle as much power. The StenLight uses a DC-DC converter to very efficiently convert the battery voltage (typically 7 to 18 volts) to the voltage the LEDs need (ranging from about 5.4 volts on Low to 7 volts on Turbo). The DC-DC converter also provides current and temperature regulation at the same time, which ensures that the LEDs are always operated within their limits. This is most critical on Turbo mode, but all brightness settings are regulated.
