is this an actual green light or simply a light with a green filter on the front?

The outside lens is actually clear, ...........but it also looks like the bulb itself is clear or white.........I believe it gets its green hue from a little green square BEHIND the bulb. That's the best I can tell.

What wavelength does it emit? looking for 660 nm.

no, it's not 660nm, the wavelength is from 620nm-625nm.

how long does the battery last?

The standard AA battery lasted several hours and was still strong when I replaced it with the 14500 battery which has been in for a week and used 5 hours and is still strong as new. I picked up a rechargeable 14500 kit on Amazon it is working great, good investment to pair up.

I am confused! this is advertised as a uv (ultraviolet) light but reviewers talk about it being red or green! what's going on?

Yeah, you see that a lot now. Sellers sell multiple versions/styles/colors of a product from a single page. It can be very frustrating when it's completely different styles of a product, like shoes. But, I have a red and a white version of this flashlight and they are great! I just placed an Amazon order. I wish I would have remembered to order the ultraviolet one. The body is apparently made of aluminum. The cree LED beam is bright and can be focused down to the square shape of the LED. When the beam is wide it provides a clean consistent circle of light, unlike old incandescent bulbs that cast overlapping rings of light and shadows. The red light is good for when you need subdued light, that is, when either you don't want to give away your position, like in the military, or when you just don't want your eyes to have to readjust to the dark when you turn off the light. It's good for trips to the bathroom in the middle of the night. I don't know how many lumens the lights are offhand, but they are pretty bright. I bet the ultraviolet light will make a room pop! I have some small one LED UV keychains that I got on Amazon and that one little LED lights up the room. Get the UV light and review it.

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Description

🔦 Light up your nights with precision and style—because ordinary just won’t do!

UV POWER PLAY - 395nm UV light reveals hidden stains, anti-counterfeit marks, scorpions, and even fuel leaks—your ultimate inspection tool.
BRIGHT COMPACT - Super bright 200 lumen white LED flashlight in a sleek aluminum alloy body, ideal for camping, cycling, and emergencies.
MULTICOLOR MASTERY - Five distinct LED flashlights—Red, Green, Blue, UV, and White—tailored for every night adventure.
STEALTHY NIGHT VISION - Red & Green lights optimized for wildlife observation without spooking animals—perfect for hunters and nature pros.
FLUORESCENT FISHING FOCUS - Blue LED enhances night fishing by illuminating reflective floats with zero glare interference.

This pack of five compact, rechargeable LED flashlights offers specialized lighting modes—Red, Green, Blue, UV (395nm), and White—each with 3 switchable modes (high, low, strobe) and a powerful 150-yard beam. Designed for professional-grade night hunting, fishing, inspection, and outdoor activities, these 200-lumen flashlights combine durable aluminum alloy construction with versatile battery compatibility (AA size, max 4V). Elevate your nighttime toolkit with unmatched color-specific illumination.

Specifications

Special Feature	Rechargeable
Color	Multicolored Light
Power Source	Battery Powered
Light Source Type	LED
White Brightness	200 Lumens
Included Components	Red LED flashlight, Green LED flashlight, Blue LED flashlight, UV LED flashlight, White LED flashlight
Product Dimensions	3.5"D x 0.8"W x 3.5"H
Voltage	3.7 Volts
Light Path Distance	150 Yards
Battery Cell Composition	Alkaline
Item Weight	2.1 Ounces
Water Resistance Level	Not Water Resistant
Brand	WAYLLSHINE
Brightness	200 Lumen
Battery Description	Different types (e.g. Lithium-Ion, Lithium, Alkaline)
Style	Compact
Finish Type	Painted
Recommended Uses For Product	night hunting observation, night fishing, pet stain detection, anti-counterfeit symbol inspection, hotel room inspection, scorpion detection at night, fuel or gas leak detection, camping, hiking, cycling, riding, home emergency
Manufacturer	WAYLLSHINE
UPC	607841994552
Part Number	SK68-ColorLight-3M-5PC-MultiColor
Item Weight	2.1 ounces
Item model number	SK68-ColorLight-3M-5P-MultiColor
Finish	Painted
Special Features	Rechargeable
Batteries Included?	No
Batteries Required?	Yes
Description Pile	Different types (e.g. Lithium-Ion, Lithium, Alkaline)

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