I'm very new to learning electronics and have a project in mind. I have a battery powered light switch with 2x12 led strips that I want to adapt for light socket use. It runs off of 3 AAA batteries. The resistor pictured is Red, Black, Silver, Gold, .2 Ohms if my math is correct. My problem is, I am not sure how to find the forward voltage for the leds without a voltmeter. I am thinking of using a DC power supply from another led light bulb to drop the voltage as well as rectify it.
I know this is probably not the best project to take on for a first but eh it's worth a shot, any help is greatly appreciated!