Streamlight Knucklehead Review

Handheld flashlights are useful in a variety of situations, but keeping your hands free while getting light where you want can sometimes be a challenge. Streamlight’s new work light series is designed to help you get the job done, and the Streamlight Knucklehead features many of the same great features as the Stinger LED rechargeable flashlight including multi-mode operation, anti-scratch coated polycarbonate windows, and a variety of charging options.

Key Specifications

  • Output: 200 lumens high, 63 lumens low, 200 lumens flash, ~1 lumen moonlight
  • Runtime: 3h 30min high, 16h low, 8h flash, 20 day moonlight
  • Battery: NiCd Rechargeable Battery Pack or 4 x AA
  • Height: 9.2″
  • Width: 2.85″
  • Thickness: 2.75″
  • Weight with Batteries (NiCd): 23.1 oz.
  • Weight with Batteries (4 x AA): 18.3 oz.
  • Warranty: Limited Lifetime
  • MSRP: $120-$350
  • Actual Pricing: ~$80 (alkaline), $140-$180 (rechargeable)

Pricing & Ordering

Depending on charger configuration, MSRP for the Knucklehead is between $120 and $350, and the light is only available in black. Alkaline models can be found for around $80, and rechargeable configurations range from $140 to $180.

In The Box

Included in the box for a rechargeable model (item # 90607) are: Streamlight Knucklehead, NiCd rechargeable battery, alkaline battery cartridge, charging stand, 4 x mounting screws, AC adapter, cigarette lighter adapter, magnet, magnet screw, hex wrench, and user manual.

For an alkaline model, the following would be included: Streamlight Knucklehead, alkaline battery cartridge, magnet, magnet screw, hex wrench, and user manual.


Proprietary nickel-cadmium batteries (rechargeable up to 1000 times), or 4 x AA batteries, can be used in the Knucklehead. Battery flexibility is a great plus for the Knucklehead, as the Knucklehead works well on both alkaline and NiMH rechargeable AA batteries such as the Sanyo Eneloop.

To charge the light, insert the base of the light into the charger, and push down until it locks.

Streamlight advises that the “memory effect” common to NiCd batteries is rare under normal flashlight use, so it isn’t recommended to condition the battery with frequent complete discharging.

The Light

The head consists of a heavy duty rubber bezel, anti-scratch coated polycarbonate plastic window, and a textured reflector. The scratch resistance comes from a silicon dioxide coating that is cured onto the plastic for a minimum pencil hardness of 3H (meaning that only a pencil with 3H hardness or higher will be able to scratch the window).

Metal contacts between the head to the body allow continuous 360° swiveling and is sealed with an O-ring.

The light is made of lightweight nylon polymer, and the electronic switch is designed to be easy to press even with thick gloves and sonic welded for durability.

On the back of the light are two attachment accessories – removable magnet with 135 lb. pull strength and a retractable hook.

On the base is the battery cover with charging contacts.

Alkaline batteries are not connected to the charging contacts, so there is no risk of accidentally charging the alkaline battery pack.


Four modes are available through a simple user interface, and pressing and holding the switch cycles through each of the modes.

Mode #1: High
A short click activates 100% mode for 200 lumens.

Mode #2: Low
When the switch is pressed for one second, the 63 lumen low mode is activated.

Mode #3: Flash
When the switch is pressed for another second, the 200 lumen flash is activated.

Mode #4: Moonlight
If the switch is pressed for another five seconds, the approximately 1 lumen moonlight mode is activated.

For all modes, a short click will turn the light off. Since the light uses electronic switches, there is a small standby current drain of 5 µA (0.005 mA), which is negligible.


The Knucklehead is rated for 200 lumens with two Luxeon Rebel ES LEDs, which produce a smooth flood beam. Due to the shape of the reflector, the beam is actually square.

The light is rated for IPX4 water-resistance, which means it can withstand splashing water from all directions, and also has safety approvals for use in hazardous environments (see Fact Sheet link at the bottom for details).


If you haven’t read our article about runtime graphs and the ANSI FL1 Standard, please click here.


Streamlight offers a variety of charging options, such as the PiggyBack charger, which charges both the light and a spare battery at the same time. It is available with a choice of standard or fast charging for the primary charger, but only steady charge for the spare battery.


It’s a busy time for IT as we near the end of the year, so it has taken us longer than usual to publish this review. On the other hand, we’ve been able to use the Knucklehead in a variety of practical situations, and it’s quickly becoming our preferred light for work. Dual-LEDs in the Knucklehead provide an even flood beam for area illumination, unlike the focused beam of a flashlight that can be blinding, especially if shined on a white or metallic surface. With the Knucklehead’s swiveling head, it’s easy to direct light where it’s needed.

One thing to keep in mind is that rechargeable Knucklehead packages cost about twice as much as the alkaline model – a significant premium. Performance with rechargeable NiMH AA batteries is similar to the rechargeable model; however, having removing the batteries for charging can be time-consuming compared to variety of charging options available for the rechargeable version. Unless you require the convenience of a rechargeable system, our verdict is that the alkaline version of the Knucklehead will offer the most utility, and value.

Pros Cons
  • High, low, flash, and moonlight modes
  • Scratch-resistant polycarbonate window
  • Dual power source, 4 x AA or rechargeable pack
  • Wide flood beam
  • Lifetime warranty
  • Pricy rechargeable model

Related Links

Streamlight Knucklehead Series (Alkaline) Product Page

Streamlight Knucklehead Series (Rechargeable) Product Page

Download the Streamlight Knucklehead Fact Sheet

Download the Streamlight Knucklehead Info Sheet

2 Responses

  1. Chris says:

    Does this light use pwm on the lower modes? I want to know before I buy one. Pwm drives me nuts!


  2. Robin Wang says:


    Yes, PWM is used.


Leave a Reply

Your email address will not be published. Required fields are marked *