I started to play with Rogue5 last month. It has blue LEDs on the side.
At first, the lights are too bright to me even blue needs only 3 batteries. Then I got rid of one of them, so LED runs on 18V. Because it's still bright, I tried 9V, but they didn't lit at all. So, I put black small dots on each LED. Lights can actually penetrate the paper seals and finally the brightness got appropriate level.
I would like LED run with single battery, if it's possible. How can I do for?