NEBO SLYDE KING 4K Review: The Light That Settles the COB Argument by Refusing to Pick

The verdict

We have not used this light. What earns it a dedicated page is not that it is a two-in-one, which is a common enough gimmick. It is that NEBO publishes a full set of figures for both emitters, which makes this the only product we cover where the central argument of this category is measured by one manufacturer, on one page, from one battery.

The published specification

Three hundred and fifty meters, and thirty-five

Those two numbers are the review. The LED end of this light reaches a published 350 meters. The COB end of the same light, drawing on the same cell, reaches a published 35. Exactly ten times the distance from one emitter type to the other, measured by the same company on the same product page.

That is not a defect in the COB panel. It is what a COB panel is. Chip-on-board mounts dozens of bare LED chips on one substrate so they light as a single broad surface, and a broad surface cannot be collimated into a tight beam because the optics have nothing small to focus. You get a wide, even, short-range flood — which is the correct shape of light for working on something at arm's length and useless for identifying something across a yard.

The water rating nobody else in this category publishes

NEBO publishes IPX7 for the SLYDE KING 4K — submersible to one meter for thirty minutes, stated with the depth and the duration. Among the work lights we cover that is the strongest water claim on offer, and it is worth dwelling on because the competition is thin.

NEBO's own OMNI 2K, the pure-COB panel below, publishes no IP figure at all and describes itself only as water and impact-resistant — a word rather than a rating, and we mark it down for exactly that. Streamlight's FlipMate publishes IPX4, which covers splashing and rain and not immersion. So the cheapest numbered submersion rating in this category belongs to a NEBO, which is not the result the rest of this site would lead you to expect.

#	Light	Max output	Battery	Lumens / $	Price
1	NEBO OMNI 2K Most COB lumens per dollar	2,000	Sealed	57	$34.88 on Amazon→ Price as of November 10, 2026 — 57 lumens per dollar. #ad How we earn
2	NEBO SLYDE KING 4K Best light with both an LED spot and a COB panel	4,000	Sealed	50	$79.99 on Amazon→ Price as of November 10, 2026 — 50 lumens per dollar. #ad How we earn
3	Streamlight FlipMate Best work light that publishes all four modes	500	Sealed	6	$82.99 on Amazon→ Price as of November 10, 2026 — 6 lumens per dollar. #ad How we earn

Prices pulled November 10, 2026. Lumens per dollar is the manufacturer's published maximum output divided by that price, recomputed every time the price moves.

What NEBO does not publish

Four gaps, and the second is the one that would change a purchase.

1. 1.Whether the cell can be replaced. NEBO names a 20650 Li-ion rated 2,600 mAh and never says whether an owner may swap it. We score it as though it cannot, which is the conservative reading and means treating this as a light with a service life rather than a lifespan.
2. 2.Anything between 4,000 lumens and 400. The flashlight end publishes one hour at full output and six hours at a tenth of it, with nothing in between. A 4,000-lumen output from a 2,600 mAh cell is physically a burst, and the mode most people would actually run — something in the middle, held steady — has no published figure at all. That is a bigger hole than the missing charge time.
3. 3.A CRI figure for either emitter. If the job is judging a paint match or telling one wire from another, this light cannot tell you whether it is up to it, and COB renders color poorly as a class. Streamlight's FlipMate publishes 90 CRI at 4,000K with a runtime beside it, and that is the specification this light has no answer to.
4. 4.A charging time. On a 2,600 mAh cell that is a practical question with a practical answer, and the spec sheet does not give it.

Against those, what it does publish is unusually complete for the price bracket: seven modes, seven runtimes, beam distances for the four white modes, a numbered water rating with depth and duration, and a 35-hour figure for the 4-lumen red task light that most brands would not bother to measure.

1. Most COB lumens per dollar

NEBO OMNI 2K

Lumens per dollar

57

Two thousand lumens of COB flood with a published runtime for all six modes, a 4,000 mAh pack that will also charge a phone, and magnetic handles that let it hang anywhere. What it does not have is a numbered water rating, and COB panels render color poorly as a class.

Max output

2,000 lm

Runtime

1.3 h

Battery

Sealed

Water rating

None published

What it gets right

• A runtime published beside every one of the six modes, which is more than most work lights manage
• Two thousand lumens of flood for the price of a tank of gas
• Rotating magnetic handles, so it hangs or stands wherever there is steel
• The 4,000 mAh pack doubles as a phone charger in an outage

What it gets wrong

• No IP figure at all — 'water-resistant' is a word, not a rating
• Built-in pack, so the light is refuse when the cell is
• COB panels have poor color rendering as a class, and NEBO publishes no CRI figure
• 1.3 hours at full output is a short evening

Published specification

• Dual COB, high: 2,000 lumens, 1.3 hours, 70 m — NEBO published specification
• Dual COB, low: 250 lumens, 5.5 hours, 22 m — NEBO published specification
• Single COB, high: 1,100 lumens, 2 hours, 50 m — NEBO published specification
• Single COB, low: 150 lumens, 9 hours, 18 m — NEBO published specification
• Red COB: 20 lumens, 11 hours, 8 m — NEBO published specification
• Red COB flash: 20 lumens, 20 hours, 8 m — NEBO published specification
• Battery: Built-in rechargeable pack, 3.7 V, 4,000 mAh — NEBO published specification
• Power bank: 4,000 mAh output for USB devices; port count and amperage not published — NEBO published specification
• Charging: USB-C, 2 to 8 hours depending on the output of the USB source — NEBO published specification
• Water rating: None published — NEBO states only 'water and impact-resistant' — NEBO published specification
• Folded size: 4.8 x 6.25 x 1.875 in — NEBO published specification
• Weight: 0.5 lb — NEBO published specification

Skip this one if

you need to see color accurately — wiring, paint, a leak, a wound. A COB panel is the wrong emitter for that job and no amount of lumens fixes it.

Buy it if: anyone who wants the most flood light per dollar for a garage, a campsite or a power cut, and who will keep it out of the rain.

• Output 9.0
• Battery 5.0
• Build 6.0
• Usability 8.5
• Overall 8.0

$34.88 on Amazon→

Price as of November 10, 2026 — 57 lumens per dollar. #ad How we earn

2. Best light with both an LED spot and a COB panel

NEBO SLYDE KING 4K

Lumens per dollar

50

One body, two emitters: a 4,000-lumen zoomable LED at one end of the slide and a 1,000-lumen COB work light at the other, each with its own published runtime. It is the cheapest way to stop choosing between throw and flood, and the clearest demonstration of what each emitter is actually for.

Max output

4,000 lm

Runtime

1 h

Battery

Sealed

Water rating

IPX7

What it gets right

• A spot and a flood in one body, each with a published runtime
• IPX7 with the depth and duration stated, which the OMNI 2K does not have
• Twenty-four hours on the 100-lumen work mode is a genuinely useful number
• Magnetic base and a red task mode that runs 35 hours

What it gets wrong

• NEBO does not say whether the 20650 cell can be replaced, so we score it as if it cannot
• One hour at 4,000 lumens, and no sustained figure between that and the 400-lumen low
• 1.1 lb and eight inches — this is a toolbox light, not a pocket light
• No CRI published for either emitter

Published specification

• Flashlight, high: 4,000 lumens, 1 hour, 350 m — NEBO published specification
• Flashlight, low: 400 lumens, 6 hours, 100 m — NEBO published specification
• Work light, high: 1,000 lumens, 4 hours, 35 m — NEBO published specification
• Work light, low: 100 lumens, 24 hours, 10 m — NEBO published specification
• Red task light: 40 lumens for 6 hours, or 4 lumens for 35 hours — NEBO published specification
• Red flashing: 40 lumens, 12 hours — NEBO published specification
• Battery: 20650 Li-ion, 2,600 mAh, 3.7 V — NEBO does not state whether it is replaceable — NEBO published specification
• Water rating: IPX7, 1 meter for 30 minutes — NEBO published specification
• Beam: 4x zoom, slide-to-reveal COB panel, magnetic base — NEBO published specification
• Weight: 1.1 lb — NEBO published specification
• Length: 8.15 in closed, 10.25 in extended — NEBO published specification
• Charging time: Not published — NEBO published specification

Skip this one if

you want one small light. This is a deliberately large two-in-one tool, and the compromise it makes is size.

Buy it if: anyone who keeps one light in a truck or a toolbox and needs it to both reach across a yard and light up a bumper at arm's length.

• Output 9.5
• Battery 5.0
• Build 8.0
• Usability 8.5
• Overall 8.3

$79.99 on Amazon→

Price as of November 10, 2026 — 50 lumens per dollar. #ad How we earn

3. Best work light that publishes all four modes

Streamlight FlipMate

Lumens per dollar

6

Streamlight's answer to the COB panel is an LED panel with a 90-CRI mode, and a runtime printed beside all four outputs. You pay several times what a COB bar costs and you get a quarter of the lumens; what you get back is light you can judge color by and a 2-meter impact rating.

Max output

500 lm

Runtime

4 h

Battery

Sealed

Water rating

IPX4

What it gets right

• A runtime beside all four outputs, including both 90-CRI modes
• 90 CRI at 4,000K — the only work light here you can judge a color by
• A numbered 2-meter impact rating and a numbered IPX4 water rating
• Magnetic base, hang hook and a head that turns 270 degrees

What it gets wrong

• Five hundred lumens against two thousand from a COB panel costing a fraction as much
• IPX4 is splash resistance, not immersion
• Battery capacity and replaceability are not published
• No beam distance or candela figure for either emitter

Published specification

• Cool white, high: 500 lumens, 4 hours — Streamlight published specification
• Cool white, low: 250 lumens, 5.75 hours — Streamlight published specification
• 90 CRI (4,000K), high: 400 lumens, 4 hours — Streamlight published specification
• 90 CRI (4,000K), low: 200 lumens, 6 hours — Streamlight published specification
• Emitters: Cool white LEDs plus 4,000K 90-CRI Color-Rite LEDs — Streamlight published specification
• Water rating: IPX4 — Streamlight published specification
• Impact resistance: 2 meters, tested — Streamlight published specification
• Charging: USB; 4.5 hours to recharge — Streamlight published specification
• Weight: 8.70 oz (246.64 g) — Streamlight published specification
• Length: 4.58 in folded, 7.94 in extended — Streamlight published specification
• Fittings: Magnetic base, stowable hang hook, 270-degree rotating head — Streamlight published specification
• Battery capacity: Not published; Streamlight states one Li-ion cell — Streamlight published specification
• Beam distance: Not published — Streamlight published specification

Skip this one if

you are lighting a whole garage. This is a task light for the thing in front of you, and a 2,000-lumen COB panel will flood a bay far better for far less.

Buy it if: anyone whose work is close, detailed and color-dependent — wiring, paint, bodywork, a bench — and who wants the runtime printed before they buy.

• Output 5.5
• Battery 5.0
• Build 9.0
• Usability 9.0
• Overall 7.8

$82.99 on Amazon→

Price as of November 10, 2026 — 6 lumens per dollar. #ad How we earn

Who should skip it

• Anyone who needs to judge color. No CRI is published for either emitter and COB is poor at this by nature. The FlipMate is the light for wiring, paint and bodywork, and we review it separately.
• Anyone who wants the most flood light per dollar. NEBO's own OMNI 2K publishes 2,000 lumens of dual-COB flood for well under half the money. If you only need the panel half of this product, buy the panel.
• Anyone carrying the light. At 1.1 pounds and 8.15 inches closed this is a toolbox or truck-door object. It is not a belt light and it is certainly not a pocket light.
• Anyone who needs a documented sustained output. One hour at 4,000 lumens with nothing published between there and 400 means the usable middle of this light is undocumented, and if you need to plan around a specific brightness for a specific time, that matters more than the headline.

How we rated it

Published output over the live price, adjusted for battery architecture and published ratings, as on every page here. Three adjustments apply. A cell whose replaceability the manufacturer declines to state earns no credit for being replaceable, which is the main thing holding this light back. A numbered water rating with a depth and a duration is credited, and IPX7 is the best in this category. And a runtime published beside every mode is credited, because a seven-mode sheet with seven durations is a manufacturer that has measured its own product rather than estimated it.

What we cannot tell you

We have not used this light. We cannot tell you how the slide mechanism holds up after a year in a truck, whether the magnetic base holds the full 1.1 pounds on a vertical panel, or how close either emitter comes to its published figures. We particularly cannot tell you what this light does between 4,000 and 400 lumens, because NEBO publishes nothing there and we will not interpolate — that gap is a finding, not something to fill in. NEBO also states no test standard for any of these figures, so they are the manufacturer's own claims rather than measurements to a published method.