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I am a beginner with LED lights, but would like to use a 5mm 365nm UV LED diode to make a pendant with a small fluorescent crystal. I would like to create a very simple, very compact circuit with a coin cell (watch battery), and an on/off switch. What would be the easiest way to do this?

I had asked a similar question earlier, but have a brief additional inquiry to make. How would the circuit change if I wanted to use an LED chip instead? Or if I added other diodes for extra brightness?

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    \$\begingroup\$ You already have an unresolved question on this at Coin cell to power a 5mm UV LED? do not re-post, especially when you existing question remains unresolved. \$\endgroup\$ Commented Dec 4, 2020 at 17:26
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    \$\begingroup\$ I’m sorry? I’ve clicked the solve button now... I thought with the circuit diagram posted it would be closed already... \$\endgroup\$ Commented Dec 4, 2020 at 22:38

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