Yokiamy
(Yokiamy)
15
You might try a dummy cell, so when using a 3C, you can use 1x Lithium on 4,2 V.
Or try something like this
www.ledmag.nl/eng/
I bought one of the replacement bulbs 5 years ago (Q5, which was one of the brightest leds i knew of that time), now, it is collecting dust…