Review on Alonefire SV18 - Rechargeable 12W UV Flashlight For Stain Detection & Resin Curing With Battery & Charging Indicator - Perfect For Scorpion & Pet Urine Detection by James Wickware

The body of the light is much too short for the included battery, so getting the threads started was a pain. I also had to torque the cap and barrel very tight to get electrical contact through the body. The negative terminal of the battery is now caved in, the positive terminal is bent, and the positive terminal spring in the flashlight is bent.I put in an 18650 to try the light out. It puts out a lot of UV light! The spill light is a reasonable width, but the spot is too intense for most of my applications. Since I use my uv lights mostly in the dark, I really need more of a narrow flood, vs the classic spill plus spot. It would work great at a distance, but I am rarely checking for leaks or looking for scorpions at 50 ft.Recommendations to the manufacturer:1 - Offer a version with an orange-peel reflector. This will spread out the spot without further diffusing the spill.2 - Lengthen the body tube to accomodate the battery. Maybe I just got a defect, but that would still meen a QC issue.3 - Please add a couple of lower power level settings. Sometimes I don't need this much output, and it would be great to select the output based on the conditions. This would be an ideal light for whatever I am doing.If they get this sorted out, I will be buying a couple of these. I may try an unprotected cell since it might be slightly shorter.Update:I measured current draw, and got 0.9 amps. That would make this about a 4 watt light.Update 2021 02 26I "fixed" the main problem. I took the tailcap apart and modified it. Now an unprotected 21700 fits comfortably inside. For the mod: unscrew the white retainer in the tailcap, take out the pin and crumpled spring, flip the white cap over, put the pin back in (hollow side toward the tail cap) and thread it back together. Basically removing the spring and reversing the retainer to hold the pin in place. I also carefully straightened out the crumpled positive terminal spring. One spring is sufficient, and the light can be safely used without damaging batteries. I do not charge in the flashlight, so I need to be able to swap out cells when one dies.