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Help me solve an optical puzzle. How might I make this fictional camera obscura work, given the parameters of my fictional location? [more inside]
posted by np312 on Jul 6, 2010 - 12 answers

I have a candle and its brightness is exactly one candle power or candela. If I buy a 10,000 candle power torch/flashlight, does that mean it's 10,000 times brighter (and what does that mean) or that I can see it 10,000 times further away? Are these the same thing and why do they seem unbelievable?
posted by westerly on Jun 8, 2010 - 20 answers

How much damage am I likely to do to my laptop if I leave it running with the screen closed? [more inside]
posted by Solomon on Jun 5, 2010 - 18 answers

I need advice on how to pack as lightly as possible for a ten-day trip to Italy in late June. [more inside]
posted by timoni on Jun 1, 2010 - 28 answers

What's the least offensive light beer? [more inside]
posted by A Terrible Llama on May 24, 2010 - 37 answers

Do they actually make and sell solar garden/path lights that aren't total crap? [more inside]
posted by crunchland on May 14, 2010 - 9 answers

My boss' small business, an exhibition, spends a lot of money on electricity due to all of the display cabinet's lights. Is there a grant or loan we can get to change over to low power lights? We are in England.
posted by By The Grace of God on May 11, 2010 - 2 answers

[artFilter] Can anyone tell me what light sources are being used in this art installation? [more inside]
posted by ReiToei on Apr 24, 2010 - 6 answers

Just moved into a windowless office. The lack of daylight is killing me. Please suggest hacks to brighten my office. [more inside]
posted by crazycanuck on Apr 19, 2010 - 24 answers

What just scared the crap out of me? Hallway light went on for about 15 seconds, then off, and is now burnt out. [more inside]
posted by itesser on Apr 8, 2010 - 19 answers

I have three big, lightweight, plastic spheres, and want to turn them into a three-light swag-type fixture. It would be cool to have all three controlled by one switch (kinda like a three-way floor lamp). Is there an easy way to do this? [more inside]
posted by Knicke on Mar 31, 2010 - 3 answers

SurelyThisProductExistsFilter: Where can I find a metal tube with a threaded, transparent cap? [more inside]
posted by Acari on Mar 7, 2010 - 5 answers

I'm redesigning my workspace and starting with the lighting. I'm looking for suggestions for tall lamps that I can clamp onto my table and have shades that would cover large/high watt CFLs. [more inside]
posted by palionex on Feb 17, 2010 - 2 answers

Husband got red light ticket in the mail. It wasn't him driving. He sent it back and marked the box that he wanted to contest the ticket. What should he do in court (WA state)? Does he have to say who was driving (it's a photo of the car, no picture of the driver)? He kind of has proof as to where he was at the time of the ticket.
posted by MsKim on Feb 10, 2010 - 20 answers

What's the best way to set up a dimmer switch in my room which is controlled by an alarm clock? [more inside]
posted by insperatum on Jan 23, 2010 - 10 answers

I'm looking for something like a laser pointer that can be comfortably and easily attached to one's body. Not a flashlight; this light should show a clear point that can be used to check body alignment.
posted by portabella on Jan 7, 2010 - 9 answers

Which light-weight yet powerful laptop should I buy? I like the Sony Vaio Z, followed by the MB Air and the Thinkpad X200. Am I missing any models? [more inside]
posted by bkudria on Dec 10, 2009 - 22 answers

I'm looking for something like Feynman's explanation for how a difraction grating works only for the absorbance of a colored chemical in solution. [more inside]
posted by Kid Charlemagne on Nov 4, 2009 - 2 answers

Why did my Subaru outback lose power steering on this rainy night? [more inside]
posted by special-k on Oct 13, 2009 - 15 answers

What are my options for a cheap, small Mac laptop? [more inside]
posted by attercoppe on Oct 2, 2009 - 25 answers

I have an uninsulated sunroom that gets pretty chilly in the winter, and want to make it so that it is at least room temp. and can be used for plants (without breaking the bank). Any ideas? [more inside]
posted by bolognius maximus on Sep 30, 2009 - 10 answers

While in various locales I have seen what what appear to be advertisments or graffiti that appears to be light generated that is projected onto a wall. I would like to use this technology for a sign for my business. I am not able to find anything with my google talents. Can someone point me in the right direction to locate and price this technology?
posted by citybuddha on Sep 30, 2009 - 5 answers

What equipment do I need to take clear photographs of 2-d artwork from above? [more inside]
posted by Nonce on Sep 24, 2009 - 8 answers

Can I wire two light switches into one switch? [more inside]
posted by furtive on Sep 7, 2009 - 6 answers

What should I do with this awesome vintage cat carrier? [more inside]
posted by kathrineg on Sep 7, 2009 - 10 answers

I'm looking for a nightlight that could fit the description of the nightlight in the song Birdhouse in your Soul by They Might Be Giants. Ideas? [more inside]
posted by anastasiav on Sep 5, 2009 - 13 answers

Old sun-damaged skin all over my body--is it tilting at windmills to consider light therapy? [more inside]
posted by anonymous on Aug 24, 2009 - 7 answers

7 days poolside... I need books! Tell me what to buy! [more inside]
posted by cgg on Aug 21, 2009 - 37 answers

I'm about to go on a bike accessory spending spree, and I wanted input on the most impenetrable locks, the most stylish helmets, and on everything from baskets to bells to headlights. I also would welcome any input on the best way to light a bike frame using electroluminescent wire. [more inside]
posted by Juliet Banana on Aug 20, 2009 - 47 answers

Who regularly sells 10-18mm tritium spheres (pictured at bottom), and where can I buy them reliably? [more inside]
posted by Phyltre on Aug 14, 2009 - 14 answers

Does one 200 watt bulb put out as much or more light than ten 20 watt bulbs? [more inside]
posted by leemajors on Aug 14, 2009 - 23 answers

What is the term for the depiction in art of the sun's rays shining through or behind clouds? This phenomenon. Sometimes believed to be a form of theophany. Wikipedia has an article about it, but I can't remember the name to look it up. Thank you.
posted by Kraftmatic Adjustable Cheese on Jul 30, 2009 - 14 answers

Help me turn a blindingly bright LED tube into a functional and decorative floor lamp! [more inside]
posted by pemberkins on Jul 5, 2009 - 9 answers

How do I grow food and be more sustainable in a shady city apartment? [more inside]
posted by Lord_Pall on Jul 2, 2009 - 16 answers

Calling all MeFi electricians: why does my light switch make a popping noise, and will it kill me? [more inside]
posted by feathermeat on Jul 1, 2009 - 12 answers

Please help me find replacement light bulbs for my gadget. [more inside]
posted by SquidLips on Jun 13, 2009 - 7 answers

Where can I buy THIS offensive Jesus light switch? [more inside]
posted by newfers on Jun 12, 2009 - 6 answers

Why do the glass parts of my light bulbs keep separating from the metal? [more inside]
posted by emumimic on Jun 2, 2009 - 7 answers

Your suggestions for lighting the top of a 50 ft. sculpture being displayed at our state fair? [more inside]
posted by siclik on May 20, 2009 - 11 answers

A terrible, B.O.-like smell emanates from a room in our house at odd intervals. I have a half-baked theory, which we seem to have confirmed tonight. Is it at all plausible? If yes, what can we do about it? If not, what else could it be? [more inside]
posted by DavidNYC on Apr 13, 2009 - 21 answers

How can i get rid of my white panda eyes after a skiing holiday? [more inside]
posted by freddymetz on Apr 9, 2009 - 9 answers

A rocket launch? Near San Francisco? What the hell did I see tonight? [more inside]
posted by symphonik on Mar 21, 2009 - 15 answers

What are the health effects of very light cigarette smoking (1-3 per week) over the long term? [more inside]
posted by Simon Barclay on Mar 16, 2009 - 14 answers

I need a front light for my bicycle that can attach to a basket (as opposed to handlebars). [more inside]
posted by Juicylicious on Mar 10, 2009 - 5 answers

What are these things on the light and telephone poles in my neighborhood? They popped up a few months ago and are replicating! Do I need to don my tinfoil cap? [more inside]
posted by jesirose on Feb 27, 2009 - 7 answers

Three of our lights have burned out, and it's about time I replaced them. Thing is, I have no idea where to start. [more inside]
posted by robcorr on Feb 21, 2009 - 4 answers

Does light (like heat) seep and weaken? [more inside]
posted by Pennyblack on Feb 18, 2009 - 5 answers

Where can I get a light therapy box for S.A.D. in Toronto? [more inside]
posted by yellowbinder on Feb 12, 2009 - 12 answers

Why are all light switches the same shape? [more inside]
posted by LSK on Jan 3, 2009 - 27 answers

What would you charge to diagnose a check engine light and replace the thermostat in a 2003 Toyota Highlander? [more inside]
posted by fogster on Dec 30, 2008 - 13 answers