Convoy Z1 zoomable Flashlight,SST70 LED,21700 Flashlight

I have been using Convoy Z1 with SST40 led with 18650 battery for more than one year. I used it in construction site for inspection and contractors are amazed by the performance. The zooming function is very useful. The PURE WHITE light is excellent for photography. The posted pictures were taken in broad daylight and they show the real life brightness of the flashlight. When used in pitch black conditions, it truely shines like the searchlight in Batman movie.When I saw Convoy Z1 with SST70 led on Amazon, I decided to buy one to compare with my old one with SST40. SST70 is noticeably brighter than SST40 but just slightly. But I am quite satisfied.I used 21700 high amp battery to compare with regular 18650 battery. Convoy Z1 will step down immediately from maximum lumen if the the battery cannot provide enough amperage. The best 21700 battery choices are: Molicel P42A, Samsung 30T, and Samsung 40T, according to review by "versedvaper.com". 18650 battery will work with Convoy Z1 but 21700 battery will perform much better.I have many high power LED flashlights using18650, 21700, and 26650 batteries. Most of them are too bright for daily use. The yellowish light with shadows from LED will ruin the photos. They are good for camping, searching, or just goofing around. For my work, I will pick Convoy Z1 zoomable flashlight.

Does no zoom into a tight beam as I seen others in the videos. Not sure about it. It is bright.