roltex_rohit123
New Member
hi guys i've got LED lights used in LED torch now a days. these lights lit up very brightly on my 4.1 volts Li-ion battery. but i doubt whether 5 volts from USB would blow it off. so i wanted to give it a bit protection to prevent this. Is there a need for adding resistance in series to the lights? moreover these lights cannot be connected in series. I was actually surprised to see this. could aby one help?