Make your own with IV tubing, glow powder, and hot glue. This is a small one I made, but I did make a 72mm one for my Wife's sportman flashlight. I can take a picture of that one if you want.
These that I make glow better than anything that you can buy.
Could you explain your technique for making them? Particularly mixing the powder and hot glue, then getting into the tube, also how to make the join. Would be much appreciated! Thank you!