How do I calculate the radiation energy that a surface / object receives at distance d from a light source of power W watts? I'm familiar, in theory, with the inverse square law but need help thinking about how to apply it. [more inside]
Is there such a thing as too much light in a living space? I'm looking for a new apartment. One possibility is a large studio in a high rise tower (30th floor) with floor-to-ceiling west-facing, unobstructed windows. This is in the Northeastern section of the US (an area known for hot and humid summers). The property developers have not included cellular shades, only standard mini blinds. It is lovely now in the winter and makes the apartment seem large and cheerful, but will I regret signing a lease come July?
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!
Three of the hardier herbs we had been growing in our back yard--sage, mint, and lavender--survived our absent-minded neglect and made it through the summer. As the temperatures drop, we've taken them indoors for the winter. We can provide either 1) warmth and artificial light, or 2) cold protection from the elements, but natural light all day long. What's better? [more inside]
I replaced a ceiling light in a 1950's-wired apartment. There are insulated black and neutral wires, but no ground connection (fixture has ground wire but just connected it to mounting bar). If wired backwards, what happens when I flip the switch? When I touch the fixture while power and/or switch are on? [more inside]
Clueless new homeowners here. After a shower and a use of the toilet upstairs, water started dripping through a screw on the track lighting in the kitchen. It started maybe 10 minutes afterwards and lasted maybe 10 minutes, maybe a cup or so of water total, then stopped. What happened? What do we do now? Call a plumber, presumably, but how urgent? An electrician too? Is there danger because of the light fixture? [more inside]
You are not my electrician but I was wondering if you might experienced this problem. My bathroom has a fluorescent light with a pull switch and a ventilation fan that comes on automatically. I think they run off the same circuit. The light normally comes on fine but after a while- probably about half an hour normally- the light goes off. [more inside]
Our family room has a really ugly, broken fluorescent light fixture installed flush in the ceiling. Help me figure out how to cover it up. [more inside]
I'm having problems with taking photos indoors when there's a lot of movement. Prime example: weddings. Most of the shots turn out blurry. I have a basic digital camera with a setting for low light but it's at a low resolution and too grainy to print. Without using a tripod or flash what's the best way to adjust the manual settings to compensate?
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]
Holding a mug close to my face, there is an interesting effect. It's not like other things and I can't duplicate it with other objects. [more inside]
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.
Season 4 of Game of Thrones was brutal, full of death and gore. Now we're watching Penny Dreadful, True Blood, Fargo and catching up on Hannibal, Dexter and Vikings. All of this is enjoyable, but the violence and gore has become a bit rote and unnerving. Recommend some lighter tv stuff, please. Examples of what we've liked and disliked below the cut. [more inside]
What is the easiest, cheapest, least intrusive way to have a light go on in my basement when someone pushes a button at my front door? [more inside]
I'm a 24 year old woman who needs to do some serious wardrobe updating. I'm tired of rayon and polyester, especially for summer. [more inside]
Where can I get more of this hexagonal bike tail light? It has 6 LED's, a yellow on-button, and a clip in the back. No other identifying marks. Takes CR2032 or similar batteries. Would love to buy a whole bunch more!
I spend a good deal of time video-conferencing via Skype. During summer afternoons, as the sun hits a certain point in the sky, there is strong sunlight glare from a nearby window that makes it almost impossible to work. I need screening, but cannot install permanent window treatment. I want a simple screen that I can prop in front of the window when needed. What materials or solutions will enable me to eliminate/minimize the strong glare? [more inside]
I'd like to buy a small (10-12 inch screen) very inexpensive (sub-$300) notebook, to use for reading PDFs, taking notes, and very light coding (i.e. emacs and python). Any recommendations would be most welcome. [more inside]
One of the burners of my gas stove does not go "click click click" when I turn it to "light". It does light if I turn it on and then light any of the three other burners. Can anyone diagnose the problem? Any DIY fixes?
DIY Light Fixture: I want to connect a neckless globe like this to a swag cord like this. [more inside]
Just purchased a ceiling fan that allows for 2 60W lightbulbs with a candelabra base in a closed glass dome. Need something brighter as this will be the only light source in the room. Having trouble finding small CFLs or LEDs with a candelabra base in 18W (equivalent 75W incandescent) or higher that will fit in the dome. Any ideas on where to find these kind of bulbs, or if they even exist? If not, any other ideas on how to keep the fan and to safely add some wattage? [more inside]
I have to stare at this thing an awful lot for work, and of course I stare at it recreationally too. But after a few hours a horrible dazed feeling creeps up on me. It's not eye strain, I don't get a headache. I just stop being able to think straight. This is not viable. What do I do about it? [more inside]
we have a three way floor lamp (you know, the one that goes low, medium, high as far as light intensity, and requires the special bulb) in our bedroom. recently, the switch seems to have gone wonky, and only offers low, and, if we twist the knob only a certain amount, high. while we've learned the trick to make it work, and it's not like it's hard, i'm starting to get pretty annoyed with the fact that this isn't working anymore. it was not a crazy expensive lamp, but it also was not cheap, and i like that lamp, and i don't want a different one. i assume the problem is in the socket itself. can someone who hasn't tinkered with electronics since she was a teenager (and that was mostly to take stuff apart to see how it worked) but worked as a mac tech as an adult change out the socket pretty easily, or is this something i need to leave to the professionals?
I have a candelabra chandelier (E12) and I want to use LED bulbs in them. The problem is, the bases of the bulbs are so wide that they bottom out in the socket before the bulb's end pin can make contact with the bottom of the socket. The socket does not have a tab I can pull out, and the chandelier is made in a way that replacing the sockets does not seem very accessible. I have encountered this with two different brands of light bulbs, and looking around, it seems that it is a common problem with LED lights. So, I want to stretch out my light bulbs. [more inside]
What are those things called / what should I search for to purchase one? [more inside]
I have a 150 watt ceramic infrared heat bulb similar to this one http://www.amazon.com/Zoo-Med-ReptiCare-Ceramic-Infrared/dp/B0002AQCPK that I use next to my desk to help keep me warm. It produces no visible light, only heat. Sometimes I have the urge to stare at it, can it hurt my eyes from the infrared radiation, similar to how looking at a regular light bulb can hurt your eyes? I am also interested in how these bulbs work, and the type of infrared radiation they give off if someone can explain it to me.
I've always packed light by taking a backpack on all trips and going carry-on only. But I'm going to be extensive international travel with a 35-liter backpack and want to know how to pack even lighter. Usually I only go on 1-week trips, and thus pack a shirt for every day, etc. How can I pack lighter? I've heard that Merino wool is a good material for shirts that can be worn a couple times before needing a wash. What are your tips and tricks?
I need to change the light bulb in this older overhead light fixture (and others in the building like it). Problem is, I can't figure out how to get the glass down. [more inside]
If you had a MonkeyLectric bike wheel light kit for one wheel, would you put it on the front or rear wheel? Expositions welcome. [more inside]
Could a red light camera flash lead to an unregistered vehicle ticket due to just-expired out-of-state plates? [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]
Some enthusiastic home dance party moves caused me to shatter one of the glass lampshades on this light fixture. I'd like to replace the shade, but I have no idea what lamp's brand or model is. Do you? [more inside]
Moving into a new apartment (yay!) with big windows, and I love me some sunlight. The problem is that the apartment is on the first floor and located in a pretty busy area where people will be walking and driving right by my windows a lot. Thus, I want curtains and I'd like to make them myself. My question: what fabric would allow the most light to enter the windows but also provide me with some decent privacy? [more inside]
Help me find this ridiculously obscure book. [more inside]
Our chickens [!] have trouble hopping up on their roost at dusk. We have glued a keychain LED to the inside of the coop and have been turning it on every night, and then off when they are roosting. I would like to have this turn on automatically at dusk and then off again an hour later. If this were AC I would buy a timer from the dollar store. For DC do I need to build something? [more inside]
Suggestions for a children's reading light with a timer? [more inside]
I recently moved into a new apartment on short notice. One thing I didn't realize when kicking the tires was that there is no natural light in my bedroom during the morning. This tends to make waking up an unpleasant and lengthy event—it's dark, and often I just fall asleep again. I don't want this to happen, and I've noticed that when I sleep in a room with good morning light exposure I wake up earlier and happier. So: how can I replicate a rising sun in my room? Full spectrum light (like for SAD) hooked up to a dimmer hooked up to a timer? Clever arrangements of mirrors?
I know nothing about stained-glass, but I do know that at some point, someone spent hours making this and we're finally updating the room it's in, so it's time for it to go. Just wondering what I could reasonably sell it for, and if there are any good forums for doing so (other than Craigslist).
Looking for plain shades for light bulbs in the ceiling. Having a heck of a time finding the right search terms to find something to buy something online. Pictures and details inside. [more inside]
I've struggled with depression for 30 years and have tried multiple medications/treatments, light therapy, Transcendental Meditation, etc. The last modality I had so much hope for was Transcranial Magnetic Stimulation; the treatments actually made my depression worse. Since we all know of cases where tumorous cancers have disappeared without explanation, I'm hoping someone has witnessed this occurring in a friend or loved one who's been diagnosed with clinical depression?
Is there an easy way to tell if a traffic light is on a timer or has sensors? [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]
We are relatively new to Seattle and have some friends who have a five hour layover coming in tomorrow afternoon. We do not have enough room in the car to carry them all, so they (1 father, 2 sons - ages 3 & 5) will jump on the light rail and meet us somewhere. Where would be a good, child-friendly place to meet along the light rail route to hang out for a few hours on what will likely be a rainy afternoon?
This is a light with a picture of some sort of presumably Italian religious icon. When turned on, a colorful disc rotates behind it, creating a psychedelic effect through the clear radiating slits in the picture. I want to buy something like it to modify to display my own image, but what' it called? What do I search for to find more? Photos inside. [more inside]
I work in a small shop in a male dominated trade. I am 26 but read younger (by up to 10 years if you have a weird idea of how teenagers look) small, blonde, and need to dress casually (jeans and a tshirt and sneakers) due to the nature of my work. Customer's ask me on a near-daily basis if I'm my boss's daughter. I hate this, I feel it undermines my value as an employee who has worked hard to be in the position I'm in. I'd like to think of a response that makes them feel like a ninny for one second, without offending customers. [more inside]
I suspect my partner may be an ectotherm. Is there such a thing as the combo full-spectrum lamp + heat rock that you'd get for a lizard tank but for adult humans? Anyone have any success making one? [more inside]
I'm looking for a nice, inexpensive task lamp to put on my desk at work. It should have adjustable brightness (low/high is fine) so that I can have either a little or a lot of light, as required. Free-standing, not clamp-on. $30 or less would be ideal. Help? [more inside]
Looking for a fun spring movie to watch on Easter. [more inside]
A few months ago, my car's check engine light came on. They fixed it, it came back on again, they fixed it again, and now it's back on. I'm looking for possible explanations so I'm more prepared when I take it back yet again. [more inside]