I would like to run some portion of one of those cuttable LED strips off of a battery or batteries. Is this possible? How do I calculate how to do that given that these strips use 12v DC converters to run when plugged in?
Overhead light with obscure bulbs long burned out so I don't know if it worked recently. Removed same. Confirm with voltage tester that hot wire is hot, neutral wire neutral, ground wire firmly attached to box. Installed new lighting fixture with LED bulbs. Put on juice. Light goes on for half a second, then died. Uninstall, check lights & fixture with known power, works fine. Repeat. Connections appear firm. (I've done this before.) Brief light, fade. Repeat. No light. Works fine elsewhere. Thoughts? [more inside]
There is an LED toy that I want to recreate. It was the length of an umbrella, without the canopy, and looked like the person was being followed by a bobbing, waving band of fireflies. Details inside. [more inside]
I'm looking at a new car purchase and have noticed that the "better" headlights (HID or LED) are typically only available on the highest trim level or with an options package that includes a bunch of other features that I'm a lot less interested in. What should I know about doing an aftermarket install of HID or LED headlights on a new car purchase in the US? [more inside]
I last bought a new TV fifteen years ago (an excellent Sony that has aged very well, but is SD and increasingly obsolete). We've decided it's time for us to step up to the 21st century. I'm finding myself overwhelmed by the array of brands and models of current flat screen HD tvs. I understand the basics (plasma is out, LED is basic, OLED and 4K are the hot new standards), but I am wondering what people's recommendations for best mid-range (under $750) tv makes and models are. Should I count on using a set's built-in smart features, or should we be looking to save a bit on a non-smart model, and buy a Roku? Also, are there special considerations for setting up and calibrating current TVs to get a decent picture?
Does anyone know about whether a warm-toned LED light acts like a regular incandescent light in terms of effects on melatonin/sleep cycle? Thank you ! [more inside]
What kitchen (or elsewhere) LED under-cabinet lights have you used? Were they good or bad? Do you wish you'd done it differently? [more inside]
I've installed new LED-compatible dimmer switches. But I still find that the dimmable LED's I've bought don't dim all the way. [more inside]
I am looking for ways to simplify/automate my apartment. Things like automatic lighting, automatic fridge contents lists, everything turning on/playing music when I enter my apartment, and any other household hacks. I don't have android OS. [more inside]
I want to start messing with LEDs; I have two (similar) projects in mind. I want a strip of multi-colored LEDs to respond to music. And second, inspired in part by this thread, I'm interested in learning about turning sound-responsive LEDs into a costume. I imagine those two projects are pretty similar, other than needing a portable power supply for the latter, right? So, can anyone help me figure out what I should get to start with? [more inside]
Winter has come. Because of my schedule and the late sunrise/early sunset, I find my daily run is happening in the dark morning or dark night. [more inside]
I bought a number address plaque from Etsy and I love it. However, the wall it is mounted to is blue, and consequently it is pretty difficult to read the sign from the street. I'd love to mount something behind it to solve this problem. [more inside]
Dimmable LED light bulbs seem more economical than halogens. But they're really expensive. Will they quickly come down in price, so I should wait? Or will they come down slowly, so I might as well start saving? Also, how good is the dimming? I tried dimmable CFL's, but they don't seem to dim past 50%.
While changing a bulb in one of our rooms, replacing a LED with a CFL because of a need for brighter lighting in this work area, it suddenly hit me: Why does an LED light have a bulb? In both incandescent and CFLs, the bulbs trap gas (or vacuum as the case may be.) But why an LED? It doesn't use a gas and it doesn't need to operate in a near-vacuum for efficiency. Closer examination showed that the bulb was plastic and had no lensing effect. This question is almost answered here. Because of the question regarding heat sinks (which seem much reduced in modern LED lights, I'm guessing the answer is because they get hot. So I'm guessing that's what it is, though I also think that having a bulb makes it easier to screw into the socket. Taking these points together, I can imagine getting a burn if there was not bulb by brushing up agains an LED stalk that was on until a few seconds ago when you decided to unscrew it. So...have I answered my own question or is there more behind the bulb?
How can I continuously run a 3W - or less - LED light with +/- 350 lumens as long as possible (1 year minimum) with a relatively compact battery source? [more inside]
Looking for a LED light that gives an equivalent brightness and spectrum as a 40W incandescent. Can you help me? [more inside]
I'm doing a craft project and would like to install two red LEDs that are powered by a battery pack with an on/off switch. I would love your opinion-advice on what to buy and where to buy it. [more inside]
Where can I buy 50W equivalent LED lights that work outdoors, operate at 120V, and are of the standard base type? I simply cannot find a bulb that meets all three criteria! [more inside]
What is the best direction to go in for LED accent lighting/throwies on a budget that demands maximum bang for the buck? [more inside]
I want to drive 20ish LEDs, should I run them as series or parallel and why ? [more inside]
What is going on in LED lightbulbs? I mean the devices, not the industry. [more inside]
How to calculate the cost of LED lighting. Or... renting my apartment, LED lights, energy conservation and fiscal sense. Please help me! [more inside]
Please help me find LED lighting options for the bathroom. [more inside]
I've been looking around at lighting options for my bedroom, and my geeky self decided that custom LED strip lighting would be awesome. Then I read previous AskMe's and want to make sure I can do this without burning down my house! Questions and a search for the easy way inside! [more inside]
How to attract the attention of a be-headphoned person in a cube across an aisle facing away from the entrance without touching them? Ideally this would be inexpensive and not require any hardwiring. [more inside]
How do I wire up a bunch of LEDs in my ceiling? [more inside]
I want to make an unobtrusive, light-based alarm to help me remember to take my pills. What do I need to do? [more inside]
How can I use the iPhone 3G's headphone jack to power an LED? [more inside]
How do I light the inside of a box? Cheaply. Efficiently. Blue-LEDly. AC 120ly. [more inside]
It seems that taillights have evolved rather radically from their humble origins, now featuring LED configurations spanning cars' entire back ends. Why hasn't this kind of innovation been seen with headlights? [more inside]