I had a few yujis but didn’t want to waste them. If these substitutes are produced in the foreseeable future I wouldn’t mine popping these in some cheap 99 cent store camping lamps and others 5mm led hosts.
Aw, you shouldn’t have posted the bill, we trust you to the very end. Needless to say a reward for you should be granted admittedly. I’m really really thankful you make rare (hard to obtain where I live) leds available for us.
There are some Varta hosts for multiple LEDs (up to 7). From the technical data I assume current is well within the specs, i.e. <=25mA. Those Vartas are not bad qualitywise, but I have not tried to open them. Yet.