Don't know if it's quite the thing you're looking for, but I carry a Inova Squeeze Light.Quite inexpensive, little bulk or weight, bright little led light, has replaceable batteries and it comes with a little clip so you can hook it somewhere where you won't lose it. I keep mine on a cord with my whistle.It's the first one on this Amazon page. I included all the Inova ones in case you fancy any of their other ones.
Try this inexpensive perfect little beauty ...https://www.amazon.co.uk/UK-DIRECT%C2%AECREE-Lumens-Flashlight-Zoomable-Torch/dp/B00QKG7EKC/ref=pd_lpo_vtph_200_lp_t_2?_encoding=UTF8&psc=1&refRID=CZV17PCWBY5RVQYCYMB4
Try this inexpensive perfect little beauty ...https://www.amazon.co.uk/UK-DIRECT%C2%AECREE-Lumens-Flashlight-Zoomable-Torch/dp/B00QKG7EKC/ref=pd_lpo_vtph_200_lp_t_2?_encoding=UTF8&psc=1&refRID=CZV17PCWBY5RVQYCYMB4 [nofollow]
I must say I agree, I swear by these torches, have several and am never without one. They're so cheap I have 4 or 5 in various pockets/ bags. The downside is as mentioned the time it takes to have them delivered, so order well in advance of when you need them!Best regards, Paul