Learn a little about a 5050 SMD (Surface Mount Device) LED. See my test bed and how I test warm white and cool white 5050’s.
They’re called 5050 because their dimensions are 5.0 x 5.0 mm. They operate at 60mA, 3V to 3.2 Volts. In my video I show that there are actually 3 LEDs in each 5050 package. So you could just light one or two of those and only use 20 or 40 mA if you want to reduce the current used.
I get the 5050 LEDs from Amazon here
Here’s a link to the copper tape
I get my alligator clip test leads locally, but these look pretty good if you need to order online
I have several of the battery holders with a built-in current-limiting resistor and on/off switch. Let me know if you’d like to purchase one for $3.95 and free shipping.