Advancedmart Chromed Brass 0.5W LED-050CR2

Light Type: 0.5W LED
Light Class: Pocket / General Use

The Advancedmart Chromed Brass 0.5W LED-050CR2 is a really cute little keychain/pocket light. It has a silver finish, is knurled for grip, and has a clickie switch on the tailcap. The Security Quality LED is one of the newer 8mm 0.5 Watt LEDs and inside is a boost circuit to help with maintaining brightness over time.

The body is made of chromed brass with a silver finish. Near the head are 3 decorative rings machined in the body followed by a wide band of knurling which is fairly aggressive and provides a very good grip. Another ring of knurling surrounds the tailcap for ease of removal when it comes time for a battery change. The tailcap has a drilled tab for the keychain attachment (included) and has a domed clickie in the center of the tailcap.

At the front of the light you will find a recessed plastic lens with the 8mm 0.5 Watt Security Quality LED inside a smooth reflector. Despite the use of a smooth reflector, the beam is quite nice. Inside the head of the light is a DC-DC boost circuit to power the Security Quality LED with the single CR2 lithium cell in the body tube. The circuit also regulates output to some degree, keeping the light from simply dropping off as it normally would without the circuit.

Output is in the form of a bluish tinted beam which has a distinct wide central spot surrounded by a distinct corona. Only very slight imperfections in the beam were found. I was a little surprised by the output, it is a bit dimmer than the AA cell model of the same light. I should add that, per the supplier, this light was actually designed to run on either a rechargeable CR2 or a normal CR2 cell. The rechargeable CR2, when charged, has more voltage than a normal cell. The result is that they made them a bit dim so they didn’t fry with the rechargeable cells. Unfortunately I don’t have any rechargeables of that size to test with.


Beam at one meter at target center

Runtime Plot: Re-run since initial posting with a new Duracell battery. Much better runtime this run. There is definitely a boost circuit in there working.


Runtime completed with Duracell batteries. More information on runtime plots is available HERE.

The switch is domed so that it matches the contour of the tailcap. It is a reverse clickie – the light doesn’t come on until after the switch is clicked. Some people don’t like this setup, but in a pocket/keychain light it can be very beneficial. If the button is pressed by accident the light doesn’t come on unless it goes all the way in and clicks. This helps prevent accidental draining of the battery while packed or in the pocket. Pressing the light’s tailcap on a flat surface until the switch is flush with the opening in which it sits does not turn on the light. Activation can only happen if the switch is pressed in beyond the end of the tailcap, thereby reducing accidental activation even more.

The light has an O-ring seal on the tailcap, which was well lubricated. You may want to throw a little silicone grease on the ring to help keep it in good condition every once in a while. As for water resistance, I’m not too sure about the tailcap switch, but I’d say it’s splashable at a minimum.

Ergonomics: It’s a good size for a keychain light, but it has a little heft. The knurling provides good grip and the clickie is easy to activate with the pad of my thumb. No real issues here.


Size compared to a common 2AA aluminum light

A single CR2 Lithium cell powers the light. To change the battery simply unscrew the tailcap and drop out the old cell. Place a new one in positive first and reattach the tailcap. I am told by the supplier that this light can also be powered by rechargeable CR2 cells.

A keychain attachment is included and attached to the light. A cute little nylon belt sheath is also included.

What I Liked: Water resistant, Tough/impact resistant, Good output, Easy battery change, Lightweight

What I Didn’t Like: A bit dimmer than I expected.

Conclusions: An OK little keychain light. Good knurling and feels solid in the hand.