Thanks for the review. It's just coincidence that I started looking for a 2xAAA penlight yesterday. I also saw the thread on Reddit but not sure if you're more active here or there but...
I repair flexible endoscopes and sometimes use a light to inspect things like inside of a biopsy channel or various other things. The light would be mostly used on a workbench so starting off in low mode is not needed or preferred.
I use this microscope (personally owned) that has a 1W LED. It is plenty bright when working with something that's on the bench under magnification but is cumbersome to move the whole microscope/goose neck to view something off the table.
https://www.amazon.com/dp/B005C75IVM/?tag=cpf0b6-20
Do you have any other penlights for a direct comparison? Someone mentioned in the YouTube comments that they had a ThruNite Ti4T and you said that this Lumintop is not an upgrade. Why is that? Besides ThruNite and the IYP365, other models I found in this category was the Preon 2 (apparently the new gen is close to $50) and Nitecore MT06.
I was about to order the IYP 365 because of your review but didn't because of the Ti4T comment. I think I like it better than the other options mainly because of the Nichia 219BT (I still prefer using the incans in my sig over LEDs) but color rendition is not a #1 priority for this specific use which is for inspection is tight places/crevices.
EDIT:
Just purchased the IYP365 and paid the extra $4 for overnight shipping so I should have it Thursday.