To activate the COB light, simply pull the head from the body. The COB light will turn on directly when you start pulling, even with only 3 millimeters moved. That means that the light will be turned on, while covered for 95% by the flashlight body. Measurements were taken indoors at 5 meters with a Hagner E4-X Lux Meter. Measurements were recorded after 30 seconds, as per ANSI FL1 standards. Mode COB: Starts at around 627 lumens, and after 30 seconds 581 lumens, and 565 lumens at 60 seconds. Runtime (10% of 581 lumens) is at 7h01min and turns off at 7h28min. Throw Measurement Press the button a second time to activate flashing red mode, which is 40 lumens, shining for up to six hours. The runtime test was done with the 50cm integrating sphere, and Extech SDL400 data logging Lux Meter.

I’d like to point out the weakness of normal zoomie flashlights, and that’s the loss of light when the beam is focused into the tightest spot. The focusing lens is far from the LED, and a lot of light from the LED will be lost because it bounces around. The user interface on this light is very easy to understand. But there are a few things that you wouldn’t know unless you read the manual.. but since real men don’t read manuals, better pay attention now. If you calculate the loss of light, with the numbers above, you see that both the Highest output and Lowest output had a loss of 61%. This is a lot, but quite normal on focusable flashlights.

I also measured it between 20-30% from the outer ring of the beam, and it dropped to 7000K. The yellowish ring on the outside of the beam is about 4500K. To activate the SLYDE KING 2K's signature COB work light, simply extend the flashlight out by pulling the top and bottom of the light. The work light will activate automatically straight into high mode, so be careful not to look directly at the light when opening. In this mode, the light is 500 lumens, shining for four hours. You can also dim the light in this mode by holding down the button as before with the flashlight. This mode is 50 lumens shining for 24 hours. All output numbers are relative to my homemade Integrating Sphere. It is set up with an Extech SDL400 Lux Meter for measurements including a Kenko PRO1D ND-16 filter. The base measurement is done with a Convoy S2+ that has been tested at 255 lumens. It’s interesting to note that the CCT is supposed to be 10000K and extremely cold, but in person it’s not really blueish. The NEBO Slyde King 2K is the upgraded version of the popular Slyde King, which is a rechargeable multi-functional unit capable of being used as a torch or work light.

The switch is shrouded and lit when the light is turned on, and the color indicates the battery level. The following colors are available: It doesn’t mean that I want to see this in every light.. actually not. But I can totally understand this on a work light like the 2K is advertised as.

Nebo doesn’t mention anything about the brand of LED that is used. From the front, the LED is clearly visible, but I’m also not sure what brand and type it is. It’s an LED with 4 dies in 1. It sits behind a (plano) convex lens in the middle of a white centering ring. The LED isn’t perfectly centered, but that’s probably not a big problem. With the flashlight extended, pressing the button once, will put the work light in red COB mode. On high, this mode is 40 lumens, shining for up to six hours. The light can also be dimmed in this mode by holding down the button and on low, Nebo used a very strong magnet in the tailcap. This is probably the strongest magnet I have ever found on any flashlight. So that’s a good sign, especially when you consider this to be a work light. I was talking about the main tailcap, because it has 2 tailcaps. Underneath the main tailcap with magnet sits another tailcap that will give you access to the battery. This one has some traditional knurling and is only accessible when the COB light is turned off. The Lowest output starts at around 190 lumens, drops to 148 lumens in 30 seconds, and 66 lumens in 1 minute. It’s interesting to note that the light drops in steps, and not gradually. That’s kind of hard to tell in this graph, because the measurements are done every 5 seconds. You’d have to look at the 10 minutes graph to see this. The runtime is supposed to be 10% of the initial 30 seconds reading, so that means about 6.6 lumens. That’s about 16 hours. At 17h06min the light finally turns off.