Diamond LED Bulb Replacement for Mag-Lite, retail $24.95 (www.quality-items-flashlights.com...)
Manufactured by (unknown) for QualityItemsOnline.com (www.quality-items-flashlights.com...)
Last updated 05-23-08

The Diamond LED Replacement Bulb is designed to replace the incandescent bulb in your 3-C or 3-D Mag-Lite. Instead of a fragile filament that glows white hot, the Diamond has a 3 watt white Luxeon LED to produce its light.

Although some heat is generated by the Diamond, it is considerably less than the heat produced by the incandescent bulb.


The Diamond comes in a jewel-type, transparent plastic case. Open the case, and remove the Diamond.

Unscrew and remove the bezel on your Mag-Lite, and throw it away...O WAIT, YOU'LL NEED THAT!!! So just set it aside instead. ;-)

Unscrew and remove the metal collar around the bulb, and put it in a drawer or something so you don't lose it. Remove the old bulb, and STOMP ON IT!!! Or just put it in the same drawer as the collar if you're adverse to breaking things.

Screw the Diamond into the Mag-Lite's receptacle until it stops turning. Place the bezel back on your Mag-Lite, and screw it down until it stops. There, done with that. :-)
Aren't you glad you didn't throw that bezel out now? ;-)

To turn the light on, press the rubberised button on the barrel until it clicks, then release it. To turn the light back off, press and release the button the same way again.

For momentary (signalling) mode, press the button more lightly - before it clicks - and hold it that way for as long as you need light. Release the button to turn the light back off.

The Diamond-equipped Mag is focusable; turning the bezel (head) one way or other changes the focus.

Change the batteries like you would any 3-C or 3-D Mag.
Unscrew and remove the tailcap, and relieve the flashlight of its expired batteries. Dispose of or recycle them as you see fit.

Insert three new batteries, button-end (+) positive first into the flashlight barrel. Screw the tailcap back on, and be done with it.

This bulb is designed specifically to be installed in 3 cell Mag-Lites, using C or D cells. Installation in a Mag with 4 or more cells will probably blow it up, and installation in a 2 cell Mag will probably result in greatly reduced light output.

Measures 757mA on a brand new set of Radio Shack Enercell Plus alkaline cells.

It runs for 2:20 (two hours twenty minutes) to the half-intensity (50% intensity) mark, and almost three days after that point. This test was conducted using a 100% duty cycle (continuous "on" operation), and a set of Radio Shack Enercell Plus alkaline D cells.

The Mag-Lite is a reasonably durable instrument in and of itself. One of the most common failure modes - the incandescent light bulb blowing out or developing this useless, ring-shaped beam when the flashlight is dropped - is eliminated when you replace the bulb with a Diamond. I can't do the durability tests on this flashlight now because they'll probably queer the test I'm currently running on another product when the table they're on is struck with this flashlight. And I've already spoiled one test on that product; better not make it two.

The beam that comes out of the Diamond is mostly white, but seems to have a very slight greenish tinge to it when compared with other Luxeons. This greenish tinge is very slight, but it is present. Most users though, would holler out "WHITE!" when this light is used by itself and you asked them what color it was.
I don't forsee this being an issue at all, and it won't affect my rating of it.

I measured the temperature of the Diamond lamp, and came up with the following info:
Temperatures are of the lamp, at the collar where it is affixed to the Mag bulb receptacle, with the bezel (flashlight head) removed.
Measured at 5 minute intervals.

At 12:33pm PDT, the temperature is 69F (20.5C) (this was just before I turned it on).
At 12:38pm PDT, the temperature is 166F (74.4C).
At 12:43pm PDT, the temperature is 173F (78.3C).
At 12:48pm PDT, the temperature is 201F (93.8C).
At 12:53pm PDT, the temperature is 203F (95.0C).

This represents 20 minutes continuous burn time on a new set of Radio Shack Enercell alkaline D cells. The lamp does get "burning" hot, so please don't operate your Diamond-equipped Mag without its bezel, unless you can guarantee that nobody will touch the bulb or the area immediately around it.

Beam photo at ~12", narrow focus.
Measures 2,820,000mcd using a Meterman LM631 light meter.
This measurement was taken with tightest (narrowest) focus.

Beam photo at ~12", widest focus.

Product was sent to me by a fan of the website, and was received on 05-07-04.
Whether I have to send this bulb back or not is contingent on how well I like it. So far, so good.
Yes, I *do* like what I see so far.

Product is being tested in a 3 D cell Mag-Lite, that was originally hosting a TriLight.
I chose this flashlight because it was the only 3-cell Mag that was handy at the moment.

UPDATE: 05-23-08
The manufacturer's (first-level reseller's anyway) website is no longer a valid URL.

Very, very bright when at tight focus

Designed to fit only 3-cell C or D Mag-Lites
Not regulated - reaches half-intensity point VERY quickly when compared with total runtime

    PRODUCT TYPE: Drop-in replacement bulb for Mag Lite
    LAMP TYPE: 3W Luxeon LED
    No. OF LAMPS: 1
    BEAM TYPE: Depends on how the flashlight is focused
    BEZEL: Uses Mag Lite's own bezel/reflector/window
    BATTERY: 3 each C or D cells
    WATER RESISTANT: I don't believe so
    ACCESSORIES: Plastic jewel style box
    WARRANTY: Unknown/not stated


    Star Rating

Diamond LED Replacement Bulb for Mag Lite * www.quality-items-flashlights.com...

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