Do you have a link for a recommendation on a 3rd cell for this light?

Yes we do. But don't think we can post the url here as it is outside of Amazon. But, please allow us to offer some guidance. There are TWO OPTIONS to extend working time on a single charge of the cells. 1) Add third cell using the supplied extension barrel, or 2) Use higher capacity (mAh) 18650 cells, for example 3200mAH cells will give you around 5-6+ hours of working time. HOWEVER, you will see examples which say 9000mAh. The highest known capacities at the time of this writing is near 3400mAh. Anything beyond that should be examined closely as these are often inflated figures. It is better (although not mandatory) to go for good manufacturers such as Panasonic, LG, Sony, Samsung, and the like. Also, a very quick check on any examples you have is to weigh them. If any one cell is below 40 grams in weight then this indicates poor internal cell chemistry. Hope this helps. [uvBeast]

What’s the difference between this leds uv and nitchi uv (both 365 nm)?

Maybe they are from Nichia. Not many manufacturers of 365 LEDs. Makes no difference though. It's real.

Can you check oil leaks in automotive? Engine, transmission fluids etc?

Indeed. Although UV reactive dye will need to be used.

Can I purchase a clear lens separately if I don’t want to run in 365nm?

Hi Nicholas. Thanks for your question. You will always be emitting 365 nanometer wavelength UV even if you fit a clear lens. That's because the LEDs on the V3 365nm emit at 365nm wavelength. If you need a different wavelength then you'll need different LEDs. The only other wavelength LEDs available are at the 385nm and upwards end. Visible light is at around 395nm+. (LEDs also come in the 270nm range btw which is the dangerous UV). Please note that what you can use a 385nm+ UV flashlight for, a 365nm flashlight will also do in the majority of use cases. Hope that helps. [uvBeast]

Brand	uvBeast
Manufacturer	uvBeast
Product Dimensions	22 x 5.51 x 2.31 cm; 377 g
Batteries	3 AA batteries required. (included)
Item model number	UVB-V3-365
Part Number	UVB-01
Style	variant
Colour	Black
Shape	Rectangular
Material	Aluminium
Finish types	Black Anodized Aerospace-grade Aluminium
Number of Lights	3
Included Components	x2 18650 Li-ion Recharageable Cells, Two-bay USB charger with mains adapter, Extension barrel for optional third cell, UV Filter
Voltage	3.7 Volts
Specific Uses	Commercial, Residential, Professional; Professional Grade High Flux Density 365nm UV
Special features	Portable
Power and Plug Description:	disposable_batteries and rechargeable_batteries
Switch Installation Type	Hand strap
Batteries included?	Yes
Batteries Required?	Yes
Type of Bulb	UV
Luminous Flux	9 watts watts
Wattage	9 watts
Wattage	9 Watts
Bulb Features	Filtered 365nm UV, High Intensity, Long Range, High Flux Density
Item Weight	377 g
Guaranteed software updates until	unknown

uvBeast New V3 365nm Black Light UV Flashlight – High Definition Ultraviolet - HIgh Power and Long Range Professional Grade Beam Best for Professional/Commercial Use – USA Stock

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