91–100 of 143 posts
Earlier quoted context omitted.
CRI is 80: http://www.homedepot.com/catalog/pdfImages/36/36f3e188-bdb8-... which is slightly worse than most CFLs. Note that 80 is the minimum legal to qualify for Energy Star.
That's a deal-breaker. Don't buy this bulb. It will make everything look awful.
Bulbs in question are 2700K and 5000K. Does your conclusion still hold?
Earlier quoted context omitted.
In my entire life I've broken exactly 1 CFL - and I was a kid at the time. And you don't have to vent your house, that's an urban legend. The mercury is elemental mercury which isn't very toxic, and extremely poorly absorbed on top of that. (The toxic mercury is organic mercury. Some elemental mercury will be converted, which is why people worry about it - but it won't be converted in your house.)
MERCURY IS TOXIC. DO NOT TELL PEOPLE THAT IT IS NOT TOXIC. Both elemental mercury and "organic" mercury are toxic (I assume you mean "organic mercury compounds", since mercury is never "organic"). The relative toxicity of mercury does depend on the compound. Dimethylmercury is exceptionally poisonous: it will go right through latex gloves, skin, and the blood-brain barrier; minute concentrations will kill you. Metall…
I don't see why this has capitals?
The point was valid it's urban legend / vaccinations cause autism style rubbish about breaking light bulbs being bad.
When do we get exposed to mercury in real life that we need to highlight mercury is bad in capitals? To stop people breaking light bulbs and licking them? We all know not to drink from a thermometer. I though the point of HN is we didn't have to talk at grade school/reddit level.
[Edit] And you don't need to ventilate a room after breaking a CFL. http://ec.europa.eu/health/scientific_committees/environment...
We are still in the dark ages, though. Just consider: this "bulb" has to plug into the standard 110/230V AC electrical sockets. Powering an LED is nothing like powering an incandescent bulb: you need a constant current driver delivering a precisely measured DC current that, depending on the LED, is between 300mA and (say) 1.5A. The voltage you need depends on the number of LEDs in series, but assume 3.2V per LED. If…
I agree that we need a closed-circuit DC solution for households. One efficient step-down, and then we plug rechargeable (phones, laptops, etc) in, and power LED lights off it. We still need AC to transmit power to the house, and power high-juice devices, obviously. Presumably this already exists? Any home-hackers know who's making them?
Hah... the light bulbs today are the biggest scam ever. Light bulbs made 100 years ago are still working today, because the materials used, more precisely, the filament, was made out of a lot more durable materials. However, companies quickly realized that if ligh bulbs lasted so long, no one would buy new light bulbs. If you have not seen the light bulb conspiracy, please watch it on youtube. http://www.youtube.com/…
Can you provide a name from, or a link to, a company that makes these long lasting bulbs?
The CEO has reported discredit campaigns and even death threat letters [2]
(spanish links sorry)
[1] http://www.oepelectrics.com/ [2] http://www.elmundo.es/elmundo/2012/06/03/economia/1338718307...
The website does not tell if Cree is using two band LEDs of a blue LED with yellow dotation, or a 3 band UV LEDs with R, G, and B dotations. Its likely only two band, because those are much cheaper. So they are worse than any 5 band fluorescent lamp. And not comparable in light quality with a good old light bulb or tungsten halogen lamp.
They are not suited for sewing, when you need to match the color of the thread to the cloth, and they are badly suited for electronics, when you need to read the color code of a resistor.
This page has GOT to stop moving!! GRRRR. Who decided this was a good idea?
I also had to just press the back button 8 times to get back here.
On top of that, clicking an anchor (which on any normal website would take me _instantly_ to that point in the page) scrolls slowly from top to bottom. Do that a couple of times and watch what happens when you hit the back button a few times... shoot me now.
This page has GOT to stop moving!! GRRRR. Who decided this was a good idea?
to whomever is building website thinking "oh, I know where my user wants to be in the page": please take a deep breath and rethink your assumptions.
A standard 100 Watt lightbulb gets about 16 lumens/watt. The 9.5 Watt lightbulb here can get ~ 84 lumens/watt. The 9 Watt (more blue) lightbulb gets almost 89 lumens/watt The above project can get about 90 lumens/watt.
.. but higher efficiencies and cooler temperatures are possible .. e.g: this one spaces out the LEDs and claims to get 133 lumens/watt: - I don't know if they are from CREE or from a competitor: http://www.kickstarter.com/projects/619878070/nanolight-the-...
Higher efficiencies are coming from Cree and others in the future - so it's going to get better. In the lab they're sometimes getting even in the realm of 200 lumens/watt.
This page has GOT to stop moving!! GRRRR. Who decided this was a good idea?
Except for those outdoor pictures at the bottom, because all I see is a massive amount of light pollution. Does a Burger King really need to be lit like that?
No-one is there, perhaps the lights should dim dramatically and sensors should make them come on depending on movement.
For indoors these bulbs are great, but for outdoors I care more about the excessive light pollution than the power usage.