If it were anything but an LED I might actually be concerned about the wasted energy.
924136
It is a decent enough swap for the burned out incandescent that it replaced.  Not overly bright at the highest setting.  What is odd though is that the light remains on even in the the 'off' position using the microwave touchpad.  So instead of off, low, and high, its low, medium and high.  If it were anything but an LED I might actually be concerned about the wasted energy.
3916191
Works fine but it has a little LED light when it is plugged in which just seems stupid. Without that it would be great.
251839
Watch Out - Cord contains LEAD!  If you use this light as a' plug in' light there is no switch, which means you have to physically unplug it to turn it off. This might be OK if the plug/cord portion wasn't coated in LEAD. There is a big sticker on the cord stating that it contains lead and you should wash your hands after handling it. REALLY? Also, its cute, but I wouldn't rely on it to actually illuminate your room.  I hung this light in a walk in closet (200 sq ft)... and I find that there is not nearly enough light.  I would probably need 3 of these to adequately light the space.  Luckily its cute enough and cheap enough that I could order more, but I probably won't because of the whole cancer thing.
4394348
The light output is fine, but this will completely drain your batteries if you leave them in there with the power OFF.  Brand new batteries are getting about 30 minutes of use.  Then the headlamp goes on the shelf for a few months, and the batteries are dead when I try to use it again.  By comparison, I also have an Energizer headlamp that also uses 3 AAA batteries... the Energizer headlamp lasts YEARS on the same set of batteries, with much more use.  LEDs aren't supposed to use much energy, so why is it draining the battery when it's not even in use?
2990982
Con: the bulb and bulb holder in the Maglite I installed this in had a center hole dimension smaller than the diameter of the top of the LED assembly. This required me to drill out the bulb holder collar and that is a flimsy part. It would be easy to mess it up. I used a long Unibit and held the collar with pliers. The pliers crushed the collar a bit and it had to be reshaped and re-drilled before the LED could be installed in the Maglite.

This is advertised as 33 hours at 140 lumens. That is based on 6 D cell 10,000mah batteries. With a 4 C cell flashlight I am expecting about 10 hours of output per set of batteries. Still more than twice the run time of the 105 lumen filament bulb that ships with the flashlight.

140 vs 105 lumens.
10 vs 4 hours runtime.
Still basically focusable.
Likely not to burn out.
Doubles the cost of the flashlight.
4353324
Thinking it was lighted thought a small battery, needing to wire it into the car and leads are not nearly long enough which means a double splice and double the trouble and double the opportunity for a short or other electrical failure. unhappy at information provided.
4172805
It does what it's supposed to do, it does it well, and the led lights are actually very helpful for troubleshooting. However, those same led lights are pretty bright, and if this is behind a TV or within eyesight in a dark room, you will want to cover the lights with electrical tape or something.
4459880
Kept the device on thinking there was no issue with leaving it on, as there shouldn't, until one night I noticed the LED light flicker and go out. Device doesn't seem to be working anymore. I tested the voltage output through my outlet, and it was around 110 volts, which is no issue for the device. Seems just like a design flaw.
238526
This item works - so far, and it came in the package as shown, except the bulb itself has a big burnt mark on the inside of the glass, as if it was burnt out - badly, and somehow they replaced the guts, without cleaning it first. I find it unlikely that they are recycling these things, but that is what it looks like. How else could it get burn marks on the inside of the glass?

Anyway, I need my sewing machine back, so I stuck it in there, and it lit up, so I'm keeping it. I will certainly update this review, if it only lasts a short time before blowing again. The original one on the machine didn't really last very long, either, and these things are way to expensive for a short life span. If it blows again, anytime soon, I'll be finding an external spot light, instead.  (Next time, I'll be more careful to choose a machine that doesn't need specialty lights to use it.)
4527306
I think as with any product like this, at night, with a light on behind it, its not going to be entirely one way but under regular viewing circumstances, its going to prevent someone outside from seeing in
3975968
result is quite ok. packaging of the led itself is not properly done.
1892284
Hope this manufacturer will think about creating the same product with a RED LED that would not destroy night vision and melatonin.  I have covered part of the open area to direct the light more down, but would prefer a red bulb.
1276349
It was to be used by an invalid and I was concerned about the safety.  Afraid it would be a fire hazard if left on all night with the light bulb so close to the outside covering.
2884985
I would've been happier if it had a light to let you know it is actually working.
4691277
Your backlighting won't be visible with this on. I suppose this makes sense because it would be harder to fit all the shortcuts on the keys, but I still feel like, with some vertical text or something, they could have managed to let the light shine through. On the positive, I guess I'm saving power now because my backlight is off. Typing is somewhat more difficult. I'm definitely having a tougher time than normal typing this, but it isn't awful. As is a common complaint of keyboard cover, the sides of the key covers are stiff enough that you are essentially pressing the keys down into a hole. Maybe if they made the top of the keys rigid and/or heavier, this could be alleviated... Honestly, I would have given this five stars as I feel it will effectively improve my usage of keyboard shortcuts in Live and maybe protect from a spill, but with the added price, I feel the shortcomings become more glaring.
4971336
"That's an interesting ideal to make a LED lamp, very different than the other LED lamp I purchased, and it's much brighter than maybe 3 or 4 LED bulbs put together. I saw a facebook link showing this lamp being used to convert a torch light, and it works for me too. I hate to waste energy."
1885931
My only concern deals with replacing the battery when the time comes.