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Старый 19.02.2014, 20:50 Автор темы   1
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По умолчанию ReviewTheLight: Nitecore HC50

Nitecore has long been on the cutting edge of flashlight technology, usually among the first to adopt a new user interface or feature. However, Nitecore is here stepping back to fill what was previously a hole in their product lineup: a headlamp. The HC50 is Nitecore's first head-mounted flashlight, and they've made a solid entry into the field.


Thanks to Nitecore for providing the HC50 for review.


I’ll be reviewing the HC50 in two sections: first, I’ll discuss the light objectively (the facts about the light itself), then I’ll discuss the light subjectively (my impressions about the light's performance when used for specific applications). If you have any other specific applications you'd like the light tested for, let me know and I'll see what I can do.

Video Review

Below is a video review of the HC50. Due to my old image hosting site closing down, I've got new restrictions on image uploads and have replaced the "Construction" section of my reviews with a more detailed video review.

[video=youtube;MjC-KFDzzEE]https://www.youtube.com/watch?v=MjC-KFDzzEE[/video]
This video is available in 1080p HD, but defaults to a lower quality. To select the playback quality click the settings button (looks like a gear) after you've started the video.


Objective

Manufacturer's Specifications

Price: 60 USD





Dimensions







User Interface

The HC50 is controlled completely by a two-stage switch on one end of the body. The switch is covered by a translucent material that allows red and green LED indicators underneath to shine through, illuminating the Nitecore "N".



As I mentioned, the switch is two-staged, which means it can recognize being pressed half-way or all the way down. When the light is off, a half-press does nothing. To turn the light on, give a single quick full press, and the main emitter will turn on in the brightness mode you used last. To cycle through the brightness modes in the order Lower -> Low -> Mid -> High -> Turbo, you use a half-press to the switch. A full press will turn the light back off. When the light is on, two quick full presses will activate the hidden flashing modes, Warning -> Beacon -> SOS, which can also be cycled by a half press. A full press again will turn the light off.

When the light is off, holding down a full press for about a second will turn on the two red emitters. When they are on, a half press will cycle between Red Constant -> Red Signal, or two quick full clicks will switch you back to the main white emitter's Warning -> Beacon -> SOS cycle. A single full click will turn the red lights back off.

The Warning mode is a slow steady on-off cycle, the Beacon mode is a slow steady flash that will use little power over a long time, the SOS is a Morse code signal. The Red Signal is a slow steady on-off of the red emitters.

Whenever the battery compartment cap is tightened after having been loosened, the green LED indicator under the switch cover will flash in a pattern that indicates the battery voltage using two sets of flashes. For example, three flashes followed by eight flashes means the battery is at 3.8V. I found this indicator to be in agreement with my voltage meter.

Whenever the main emitter is turned on, an indicator LED in the switch will light to give the approximate battery condition:
>50% - solid green for two seconds
<50% - solid red for two seconds
Very Low - flashing red (recharge battery immediately)


Action Shots

You can click on any of these shots to see them full size. You may need to increase your screen brightness to see beam profiles on some lower output modes.

Light on Head
(waiting on receipt of headband)

White Wall (Red, Lower, Low, Medium, High, Turbo)
ISO 100, f/3.3, 1/20"


BeamSlice


MugShot


Indoor Shots (Red, Lower, Low, Medium, High, Turbo)
ISO 100, f/3.3, 1"


Outdoor Shots (Red,
Lower, Low, Medium, High, Turbo)
ISO 100, f/3.3, 2.5"



Long-Range Shots (
Turbo)
ISO 100, f/3.3, 5"



Performance

Submersion: I submersed the HC50 under a foot of water for an hour, using the switch and control ring during that time, and found no evidence of water damaging or entering the light.

Heat: The HC50 doesn't display any significant heat buildup on the lower modes. It has a built-in thermal protection circuit, so that when it reaches a certain temperature it will reduce the output. You can see this effect in the output graph for the Turbo mode.

PWM: I could not detect pulse width modulation on any mode of the HC50.

Drop: I dropped the HC50 on various surfaces (carpet, grass, packed dirt, hard wood) and it did not suffer any cosmetic or functional damage.

Reverse Polarity Protection: The HC50 uses mechanical reverse polarity protection to prevent the negative terminal of a battery from making electrical connection with the head. (This means it will require a button-top battery for the light to turn on.)

Over-Discharge Protection: The HC50 does turn itself off before over-discharging a lion, but as always, I recommend recharging the battery before this is necessary. The HC50 includes a built-in voltage indicator that blinks the button green to show the current battery voltage, so be sure to use it.


Spectral Analysis


All light that we see as white is actually made up of several different colors put together. The relative intensities of the different colors in the mix are what determine the tint of the white we see. For example, cool white LED's have a lot of blue, and warm white LED's have more red or yellow. This measurement was done on a home made spectrometer. The plot below the picture is corrected for the spectral sensitivity of the human eye. Note: the peak in the 900nm region doesn't really exist, it's a piece of the second-order spectrum that's showing up here because of the high intensity of the light source.

Output and Runtime


ANSI FL-1 runtime ratings are the time it takes for a light to fall to 10% of it's original output (counting from 30 seconds after turning the light on).

The vertical axis of the graphs below represents a relative brightness measurement using a home made light box. The horizontal axis is time in hours:minutes:seconds. Runtimes are stated in hours:minutes:seconds. These graphs may be truncated to show detail.

Mode Comparison


Turbo


High


Medium




Throwing Distance

ANSI FL-1 standard for stating a light's throwing distance is the distance at which the peak beam intensity (usually at the center of the beam) is 0.25 lux. I calculate throwing distance and candela (lux at 1 meter) by measuring peak beam intensity at five different distances and using the formula lux*distance^2=constant.


Peak Beam Intensity: 2012cd
Throw Distance: 90m

This is slightly better than Nitecore's claim of 85m.

Subjective Review

Quick break down:

+

-


Long Term Impressions
I'll fill this part in after carrying the light for a while. If nothing get's added here, either I find nothing else worth noting about the light, or I end up not using it often.
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