JDR High-Power 3W LED Light Bulb, retail $19.95 (http://www.donsgreenstore.com...)
Manufactured by K&L
Last updated 11-17-07

This is an LED spotlight bulb that uses a Seoul Semiconducter 3 watt LED, and is designed to be screwed into any E27 medium screw base female light bulb receptacle. It is labelled to operate at voltages ranging from 100 volts to 240 volts AC (labelled both on the packaging material and on the bulb itself).

It has a generous metal heatsink for the high-powered LED, so overheating of the LED should not be an issue here.

The unit tested is cool white; according to the packaging materials, this bulb is also available with LED colors of red, orange, green, blue, and warm white.


To use this bulb, just find a place with an incandescent bulb in it that you'd like to replace. Unscrew the old bulb, and throw it onto a hard floor - love to hear those things pop!!! Or gently place it in a dresser drawer full of washrags, underwear, or other soft fuzzy things if you're averse to breaking light blubs.

Screw this bulb in the receptacle in its place...there, done with that, fun ya!!!

This is an LED bulb, not a flashlight. So I won't slam it against a steel rod, try to drown it in the john, stomp on it, run over it with a 450lb electric Celebralator thing, throw it at a wall-mounted porcelain urinator to see if it smashes open (the bulb, not the urinator), or subject it to other indecencies that a flashlight might be subject to. This bulb is made primarily of metal & plastic; though it CAN become broken if dropped, thrown, or otherwise abused. Handle it as you would an ordinary household light bulb, and it shouldn't give you any guff.

Since this is a light bulb with a set purpose, I don't have a whole lot more to say about it.

The base of this bulb is E27 (27mm), which is the standard medium screw base that is used by household light blubs in the United States.

DO NOT under any circumstances use this bulb in a fixture equipped with a dimmer switch, whether the dimmer is in the fixture itself or on the wall controlling that fixture (usually a knob but sometimes lever-style like an ordinary switch). The bulb will overheat and fail if this is done. You don't want Emperor scorpions or Rhinocerous Beetle grubs (larvae)...I mean...you don't want an unwanted fire.

The caution regarding using a dimmer is pretty much generic for any LED product powered by 110-130 volts AC; not just this bulb. Using this or any other 110-130 volts (or for that matter, 220-240 volts for viewers outside North America) AC LED product can result in overheating, failure, and possible fire because the AC waveform is altered by the circuitry in the dimmer, and AC line-powered LED products not using a step-down transformer tend to not do well with the altered AC waveform.

This bulb has a dedicated power supply in it, not just some resistors, capacitors (or "capacitators" as some people call them, or "condensers" that was the old fashioned term), and diodes; as I detect no flickering as the lamp is rapidly waved about while turned on. I tested it with an oscilloscope, and *DID* see pulses, but they were much too high in frequency to be detectable to the eye. So, flicker-free? Yes, to the eye anyway.

This bulb is rated to output 160 lumens, though I am not equipped to measure light in "lumens" because you need a special (and expen$ive) instrument called an integrating sphere to do that, and I neither own nor have access to one.

After approximately 40 minutes of operation at 115 volts, temperature of the metal heatsink was measured at 114F (45.6C).
So it's warm, but it is ***NOT*** hot. It's cooler than most CFLs and all incandescent household bulbs would be at 40 minutes.
I used a noncontact infrared thermometer to measure this.

This bulb has a transparent, prismatic plastic diffuser over the LED; this diffuser not only widens & softens the beam, it protects the LED against things like prying fingers, screwdrivers, and very minor water splashes.

Beam photograph on the test target at 12".
Photograph shows the main beam near the bottom so you can get a better idea of how it fades toward its perimeter.
The beam angle is listed as 45.
Measures 218,000mcd on a Meterman LM631 light meter.

Beam photograph on a wall at ~10 feet.

Those rectangular graphic things in the upper left quadrant of this photograph are marquees from:

Atari ''Tempest''
Nintendo ''R-Type''
Super Tiger...er...uh...Konami ''Super Cobra''
Midway ''Omega Race''
Sega ''Star Trek''
Williams ''Joust''
Venture Line ''Looping''
Universal ''Mr. Do!'s Castle''
Jaleco ''Exerion''
Gremlin/Sega ''Astro Blaster''
Gottlieb ''Q*bert''

upright coin-op arcade video games from the 1980s.

That graphic toward the right is:
A "BIG SCARY LASER" poster sent by www.megagreen.co.uk

And that clock to the right of the "Big Scary Laser" poster is an Infinity Optics Clock.

Photograph of the insides of the lamp, with the diffuser removed.

Spectrographic plot
Spectrographic analysis of the LED in this light bulb.

ProMetric analysis
Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

This analysis was taken farther behind the ProMetric's imager than usual; therefore,
the 50% full angle value may be a bit smaller than what is shown on this chart.

The bulb was farther behind the imager than usual simply because the AC cord didn't quite reach.

Test unit was sent to me by Don of DonsGreenStore.com on 11-02-07, and was received on the afternoon of 11-13-07.

Product was made in China.
A product's country of origin really does matter to some people, which is why I published it on this web page.

According to the packaging material, this lamp is RoHS compliant, which simply means that there is no mercury, lead, cadmium, or other heavy metals in it that could pollute the environment when this light bulb is eventually disposed of.

UPDATE: 00-00-00



    PRODUCT TYPE: LED spotlight bulb
    LAMP TYPE: White Seoul Semiconductor 3W LED
    No. OF LAMPS: 1
    BEAM TYPE: Wide spot w/very soft fall-off to perimeter
    CASE MATERIAL: Plastic & metal
    BEZEL: Metal; LED protected by prismatic plastic diffuser
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER RESISTANT: Very light splatter-resistance at maximum
    WARRANTY: Unknown/not stated


    Star Rating

JDR High-Power 3W LED Light Bulb * http://www.donsgreenstore.com...

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