Sci-Supply Miniature LED Flashlight Bulbs, 3 Volt Mini Lamps, Cool White, E10 Small LED Bulbs, Pack of 5

I have a very nice vintage lighted magnifier that uses 2 AAA batteries and a 222 incandescent bulb. I also have a nice 50 something Ray-o-Vac pen light that uses 2 AA batteries and a 222 incandescent bulb. I had quit using both because the incandescent bulbs don't last very long and they run the batteries down quickly. These LED replacement bulbs not only fit perfectly, they give a substantially greater amount of light than the incandescent bulbs (I used both, the difference is dramatic). Beautifully white light. Now I'm using these two vintage items thanks to these wonderful LED replacement bulbs. Longer batter life, much longer bulb life. Why would anyone want to use the incandescent 222 bulbs at all? They are truly obsolete.

Lifetime replacement for classic penlight 222 incandescent bulbs. Batteries would last as long as their shelf life, as the current draw is not much more than 10 ma. where the incandescent bulbs draw 250 ma.! Bulbs are expensive as such, but low current draw and extremely long LED life would be saved in battery and bulb replacements. One caution: You may need to reverse the batteries in your penlight as the LED bulbs are polarized, tip positive, screw base negative. In the end these bulbs become an outstanding value, because of very low bulb and battery replacement.

I got these for an ancient slide viewer whose bulb finally gave up the ghost. Appreciate the comments from others about reversing your batteries if the bulb doesn't light up the first time. The bulb is very bright. The good news is that it illuminates the slides better than an incandescent bulb. The (slightly) bad news is that there's a bright spot in the center. That's an advantage in a flashlight (the intended use), but not great when you want a diffuse and even light behind the slide. But since I'm simply using it for sorting through a large bunch of slides, it's definitely not a deal-breaker. Bottom line: Recommended.

Performance is OK, but rechargeable batteries aren't the best choice for these bulbs. So that kind of limits the efficiency gain if you have to start using disposable batteries again. A fresh set of alkaline batteries will give you a nice bright, white light; and they should last a long time (I've not tested longevity of any batteries). But whereas an alkaline battery starts out around 1.6V, depending on what battery you use, a typical freshly charged rechargeable will be 1.4, give-or-take, and the bulb will be considerably less bright. I suspect the reviewers saying the bulbs were dimmer than an incandescent bulb may have been using rechargeable batteries, or a partially used up alkaline batteries. Based on trying different batteries with known voltages, it seems once the voltage drops below around 1.35-1.30, an incandescent bulb may be brighter. For example, an incandescent bulb will still produce enough light with batteries that are under 1.2V for my toddler to use it to play under her blanket fort. This LED bulb produces no light at all at those voltages. If you are using alkaline batteries, this seems like it would be a good bulb to use. It won't work as well as the battery is used up, but it will take a longer time to get to that point than it would with a regular bulb. If you are planning on using rechargeables, it's a mixed bag. You may have to keep your batteries topped-up a bit more often than you were planning. The low energy consumption should still make up for that. But you'll never get as bright of a light with freshly recharged batteries as you will with a fresh set of alkalines. If you want a super bright light, throw in a set of disposable lithium batteries which typically start our around 1.8V.

This 40-year-old flashlight has literally been around the world as it takes easily found AA-sized batteries and has a switch that stays off when in my pocket. I've "DeoxIT-ed" all contacts but it still wasn't as bright as cheap LED key ring flashlights, so I wanted to upgrade the bulb to LED for increased brightness and longer battery and bulb life. This 3V bulb was the closest I found to the 2.2V bulb and it advertised it was for double AA battery use. The bulb was a hair wider on the threads and on the light lens, but in this flashlight it didn't matter. The LED glass didn't stick as far out into the reflector as the old bulb but it worked all the same. Enough light refracts and reflects through the glass to also bounce off the reflector. Happy with the brighter results. The only negative so far is that I had to purchase 5, but that gives me a lifetime backup supply if I can remember where I put them. 5 stars

Not very bright. Good life though. I think we have been spoiled by the newer super-bright LEDs.

This bulb works great . I had to reverse the batteries (positive goes to spring and negative goes to flat contact) I used 2 AA batteries. Bulb gives off a nice light blue glow. Good stuff!!!!

Found these to fit in my vintage occupied Japan Halloween lamps. Looked all over for original match, but no luck, so I took a chance on these and they fit!

Funcionó muy bien para reemplazar focos incandescentes en un microscopio.

This LED replacement for incandescent 3v lamp consumes negligible power (approx. 0.04 W) with same or better light output.

Not a direct replacement for an incandescent E10 screw lens bulb if size or polarity is an issue. Polarity is +ve at the tip and -ve at the bulb base. In my device, I had to install the batteries with the polarity reversed to get the bulb to work. The size of the base of the bulb's glass head is slightly larger than the incandescent version. I had to file away a bit of the cover fitting to install the bulb. Otherwise, the bulb works fine. Quite bright with 2 AA or AAA batteries. The incandescent version of the bulb is still available on the web (in 2021) if size or polarity is an issue.

We got these for my son's flashlight and they don't work. Not one of them were usable.