The absolute easiest way would be to find cheap solar powered pathway lights and rip them apart, extending wires as needed for items like the solar panel. It will contain everything you need such as the led, solar panel, battery, night sensor, and circuitry. If you want red, you'd need to get a red lens or something

This for example, but I can't say 100% it will work https://www.amazon.com/Solar-Lights-Outdoor-12Pack-Stainless/dp/B082MHLDQJ/ref=mp_s_a_1_6?crid=5E9FRZHNDOEU&keywords=solar+powered+yard+lights&qid=1658542258&sprefix=Solar+powered+yard+%2Caps%2C154&sr=8-6