91–100 of 189 posts
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It already came out last year: http://www.extremetech.com/electronics/128669-philips-new-10...
Is it any good?
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I'm not an expert (just a physics prof), but my understanding is that LEDs always emit one specific color (wavelength) of light rather than white light (which is a mixture of many wavelengths). So if you want to use an LED to produce white light, you set up a material that absorbs light at one wavelength and then re-emits it in a wide variety of wavelengths (that is, the phosphor). (This is also the way that fluoresc…
If it uses a phosphor coating, isn't it also prone to the same issue of diminishing lumens over time as the CFLs? These bulbs lose up to 30% luminosity in 6 months (the tri-phospor ones, more expensive, can a last a year begore losing 10%/20%). If they lose power like CFLs, even though the warranty is 10 years, you may be forced to replace it way before that.
This is Spam. There are a few dozen of these with better economics on Amazon. And if you want to light a house on the cheap, the LED "ropes" are more efficient, and will last longer. Also a CFT would be 12W and cost $2 ($1.25 if you look around). Over 10 years in most markets that would be cheaper. PS: My Home is almost 100% LED's. I love them. But that doesn't mean they are always the cheapest, the most efficient, o…
> These are white LEDs, that is, blue LEDs covered with a white-light-emitting phosphor Could someone explain that a bit more please?
White light is the combination of many spectrums of light. On your monitor for example, it is red + green + blue. LEDs however, only output one narrow spectrum. So, to solve this issue, the "white" LED is really a Blue LED + a material that converts the color blue into white.
You mean many wavelengths of light. The light spectrum is the sum of all wavelengths of light. Also, the plural is "spectra".
This is Spam. There are a few dozen of these with better economics on Amazon. And if you want to light a house on the cheap, the LED "ropes" are more efficient, and will last longer. Also a CFT would be 12W and cost $2 ($1.25 if you look around). Over 10 years in most markets that would be cheaper. PS: My Home is almost 100% LED's. I love them. But that doesn't mean they are always the cheapest, the most efficient, o…
I like the color temperature of incandescent bulbs. That alone is worth the extra electricity expense. It's a bit funny how many of us obsess about the calibration of our monitors and tablets, even installing utilities that change the color temperature at different times of day to be easier on our eyes. But we don't seem to care as much about the ambient light that we see everywhere. Also, many of my fixtures expose…
Efficient lightbulbs come in various color temperatures. You don't need incandescents to get the same color temperature. I don't like the harsher blue ones so I buy the warmer ones for at home.
I'll have to try one out. It may just be that I'm on the vinyl side in the lighting equivalent of the "vinyl vs CD" debate.
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Nonsense! You're eyes adjust to very low light levels, far below what a 60W bulb outputs in lumens.
Good enough to see, not good enough for fine work. 60W was enough for me a decade ago. Now for fine work I need 100W. I can still see with 60W, but what was enough for fine work a decade ago is not enough now. I understand this will get worse as I get older. I don't have any particular visual conditions; I'm just aging.
I am unimpressed by 60 watt equivalent bulbs. A 60 watt equivalent is about enough to be a desk lamp, if I need to provide light for even a small room it is a useless amount unless I get a large number of bulbs together. Unfortunately 60 watt equivalent has become some sort of benchmark for new light bulb technology. If you really want to replace lighting in some meaningful way, start quoting 100 watt equivalent numb…
If only someone made a "fixture" for lighting with multiple bulb sockets in a convenient, attractive mounting that could be attached to the ceiling of a room. The 60W incandescent light bulb has been the "standard lightbulb" since before most of us were born. Honestly I don't understand this criticism at all. Certainly LED lighting is available in many form factors other than a 60W bulb...
My condo's living room doesn't have a ceiling mounted light fixture, or a place to install one at. I'm sure the job could be done, but it'd be a major pain.
> The 60W incandescent light bulb has been the "standard lightbulb" since before most of us were born. Honestly I don't understand this criticism at all. Certainly LED lighting is available in many form factors other than a 60W bulb...
Thus I'm stuck using a stupid stand lamp, which right now is only 1 bulb. (My previous 3 bulb stand started smoking when I put in a 150W equivalent CFL, heh)
Sure 60W has been standard, but for what purpose? Just one of them is useless, and heck 3 of them isn't much better. 3 75s is actually useful, and a couple of 100s is preferred.
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Good enough to see, not good enough for fine work. 60W was enough for me a decade ago. Now for fine work I need 100W. I can still see with 60W, but what was enough for fine work a decade ago is not enough now. I understand this will get worse as I get older. I don't have any particular visual conditions; I'm just aging.
Another simple explanation, your sight is not as good as it used to be. 10 years is a long time. Just saying.
Indeed I have no trouble with low light (yet!), but just because I can read a book with a single 60W bulb in a living room doesn't mean I want to.
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Lighting is a small fraction of your overall electricity usage. HVAC alone uses many times as much. While using efficient lighting is a good idea far too many people get hung up on it when there are better places to conserve.
It depends on how many people are in your family and how frequently they forget to turn off the lights. Plus, having 400W of incandescent bulbs on is 400 more watts that the A/C system has to cool.
So your 400 watts of bulbs will consume 133 watts in the cooling process.