I am (Very much theoretically) wondering, given that chlorophyll has quite a tight absorption spectra could you use a solar panel to power an LED array that just outputs blue and red light and get more/better plants per square meter than using that square meter of sunlight. (Taking into account the significant losses in the system etc.)
We have a small bathroom (sink, toilet, small tub) on the second floor of our house that hasn't been touched since original construction (sometime in the 1950's). When using any of the three bathroom fixtures, water leaks through the ceiling below (just started last night after plunging the toilet). A plumber came out, took a look and said we'd need to rip up the entire floor as the pipes are all lead and the only solution is to remove entirely and replace with something newer. This sounds odd and expensive. Any advice/suggestions?
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 like this sconce (with the plain white shade) from Schoolhouse Electric but am wondering if there might be others available that are more affordable and/or that I might like even more. [more inside]
I am getting conflicting opinions on when you can (and can’t use) CFL and LED lights indoors, especially with a flush mount light fixture. I am more confused now that ever. If someone can offer some insight, it would be great. [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 a reading lamp which closely imitates the light of a single candle. [more inside]
Our office building is in the process of switching over to all-LED lighting. Our recessed can lights were recently swapped and it's causing a lot of grief- will we just get used to it over time or can I buy some warming filters that won't melt or look like yellow/orange/red dots all over our ceiling? I have only found theatrical lighting sources online so far. Help!
I've been switching to LED bulbs in our house as the old bulbs burn out. But despite their advertised long lifespans, the LED bulbs seem to have been burning out fairly quickly. Am I unlucky with bulbs, or could it be another problem? [more inside]
ElectronicsFilter: I would like to construct a box with 4 lights that work on a timer. I know lots about software, and little about hardware, please help steer me in the right direction. [more inside]
I have a deck, and it needs a light fixture next to the door. There's no electricity on the deck, and I can't cut through the wall (mounting a fixture to the siding is fine). Do they make battery-powered, wireless, remote-controlled exterior light fixtures? [more inside]
This is the appliance in question. I'm aware that Tokyo's electrical system is 100 volts at 50 Hz, but I'm not sure how that applies to this rope light kit, which is rated for (according to the instructions) 120V, 60Hz, and 100 mA. Does the low current/wattage (12 watts) mean it will work anyway, due to some transformer inside, or is it just not going to be compatible?
I came across this article and became concerned about my eye health, in light of a new LED monitor that I recently bought and use for about four hours each day at home (at work, I look at an older LCD monitor with a CCFL backlight for eight hours). Is this something to be concerned about? Also, can some sort of (UV) filter be placed in front of the screen to reduce risks? Currently, I have my LED monitor set to 0% brightness and 25% contrast.
I need a professional level (able to color calibrate) television/video monitor to use a client monitor. [more inside]
Making a desktop clock out of a 24-hour clock movement, a globe, and an LED. Help me design it within! [more inside]
I'm trying to help a friend locate a replacement LED Left Side Head Light Cluster for a 2006 Ford Mondeo Titanium (as seen in CASINO ROYALE). Preferably in the UK but anywhere would do - sadly everywhere I look has nothing available... thank you all in advance!
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'm remodeling the house and have converted everything to can lights. I have to go buy about 36 PAR30 bulbs and about 12 PAR20 bulbs. Where can I get the best deal? Difficulty: NO EBAY. [more inside]
Can anyone link me to some place I can buy a lightbulb the same brightness and size as a 100 watt incandescent bulb? [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]
My bathroom has six light bulbs in it and, to my shame, they're incandescents. I'd like to replace them with LEDs so I never have to think about them again. Which LED bulbs are most like your standard 60W incandescents? [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'm planning a project to put strips of LED lights on my jacket to increase my day-time visibility in heavy LA traffic, which I commute through every day. So far, I have a general plan, but I'm a little unsure of California laws regarding lights, and I have never actually worked with LEDs before so I'm looking for tips/tricks/suggestions to make it work. [more inside]
I want to make a choker/necklace with some sort of glowing red "jewel" in the center for Halloween... [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]
I have a large room that I would like to illuminate with LEDs. I'm thinking of putting a ledge around the the walls about 45 cm / 18 inches from the ceiling and laying LED strip lights along it, directed upwards so they bounce off the walls and ceiling (which are painted white). Would this look weird? Would it light the room adequately? I'd make the ledge with a groove in the top surface so that you can't see the LED lights from floor level. [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%.
When converting from halogen downlights to LEDs, if it's going to be a difficult job either way, is it better to replace MR16 sockets + transformers with GU10 sockets or just to use LEDs that are designed for MR16 set-ups? (Assume that I already know that the specific transformer I have would work with the specific LEDs I would buy). And if I want to convert, where can I buy cheap GU10 sockets with Australian 3 pin plugs wired to them (without buying an entire "LED downlight kit")? [more inside]
We haven't had a proper TV in over a decade. I would like to have something other than my laptop to watch streaming media, DVDs, Netflix, etc. Can you explain how this works in 2013? I imagine we'd buy something like this Samsung LED HDTV and some kind of speakers. Then what? Do we plug it into a laptop? What exactly is Apple TV and how does it stack up against Roku? This seems like it should be a simple question, but I feel like a caveman emerging from the dark, and am fairly bewildered at all of the options and variations out there. [more inside]
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?
What are your favorite LED christmas lights that are closest to incandescents in warmth and glow? [more inside]
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]
Can I use a CFL or LED bulb in an outside flood light type fixture that is hooked up to an in-wall Intermatic timer?
Can I use a CFL or LED bulb in an outside flood light type fixture that is hooked up to an in-wall Intermatic timer? I was told no but I would like to confirm. If that is the case, I'd love a short explanation in plain English. I tried Googling but I'm still confused. [more inside]
I'd like to buy a TV that ISN'T black. Is that even possible? [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 would like to learn more about electronics and circuitry by making a LED light panel. I have questions about how to calculate the number of LEDs I need, soldering, and how to diffuse the light. [more inside]
I would like to use LED lighting in my apartment and be able to change colors and brightness. how do I go about that?
I would like to use LED lighting in my apartment and be able to change colors and brightness. how do I go about that? [more inside]
A friend's got a Samsung LED TV which has two input jacks (appears to be the "3.5mm" type) for Component signal - 1 socket for video (red, green, blue) and 1 for audio (red, white). Problem is: where do I find these cable adapters so we can connect (5) component cables into these (2) input jacks? [more inside]
Any experience with LED replacements for recessed halogens? [more inside]
Please help me hack severe eye strain due to back-lit devices. [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]
My flat screen TV (LCD-LED) is not flat. Help? (Pics inside.) [more inside]
Can anyone recommend a book or website to help me in making a small led light? [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]
Help me find or make a shade of some kind for my recessed kitchen LED lights. [more inside]
Concerned about "backlight bleed" on Samsung 40" I just bought, can you help me out? [more inside]
I'm looking for a physical countdown clock that counts down to an arbitrary time. Ideally, it would be similar to the one that Robert Khoo has in the Penny Arcade TV Show. I believe this is the clock in question and that underneath the "New Year" is a whiteboard. If I could find one just like this, that would be great, otherwise any digital countdown clock would work fine.
School me on light bulbs! My lamp and overhead light bulbs just died, and I'd like to use the opportunity to rethink the type I'm using. I'm totally ignorant in this area, so I'll give as many details as possible, inside the fold.... [more inside]
Electronics help. I'm looking for a good informational/tutorial web site for working with high power LEDs 5 Watts and up. [more inside]