No light! because of a low voltage battery. How do you increase the voltage up? You can do many ways. And, I recommend a simple step-up converter circuit using TDA2822.
Small appliances have microcomputer that requires 5V power supply. Why it can use only 1.5V battery? The 1.5V to 5V boost converter circuit inside them.
This is simple the 12V to 24V step up converter circuit, can convert DCV from 12V to 24V at 1A max. Using TDA2004. Why is amplifier IC? It easy&inexpensive.
Simple Step up DC converter circuit using Transistor 6V to 12V!
It is a ideal for small size circuit and easy. It is a switching voltage regulator circuit. 5V USB to 12V output low current such as LED display. LEarn It moRe!