Most energy efficient way to power up LED 3528

Thank you for your insightful response!

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To clarify your previous message:

Using a single 3.7V battery requires connecting the LEDs in parallel, ensuring each one has a current-limiting resistor.

I'm curious about the function of the resistor. Why is its inclusion critical in the circuit?

Consider connecting all LEDs in series and employing a boosting converter.

I apologize for my lack of knowledge, but what is a boosting converter, and why is it necessary for my setup?

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Due to the voltage fluctuation from a lithium cell (are you using lithium?), a series resistor won't maintain constant current. As the battery voltage decreases from 4.2V to approximately 3.5V, the resistor will result in diminishing current as the battery drains.

I'm planning to use a TP; will that be adequate?

Let me elaborate further on my situation.

I aim to power a lamp emitting roughly 20 lumens for 5 to 6 hours. I'm sourcing a lithium battery (is a voltage of 3.7 good? I'm estimating a capacity of 500 to 600 mAh to achieve the desired runtime) which will be connected to a TP, in turn linked to a solar panel (what is the minimum necessary voltage to recharge the battery?). I will control the circuit with a physical switch, allowing me to turn the LED load connected to the TP board on or off (I understand that I cannot recharge while there's a load but I plan to use it at night). Given the limited space, I require a compact battery and solar panel that need to fit within a 9 to 10 cm diameter. It's essential for the solar panel to be capable of fully charging the battery. How can I optimize for maximum energy efficiency while still achieving a bright lamp?

Thank you to everyone for your contributions!

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