o****e
发帖数: 916 | 1 据说普通的节能灯泡有紫外线和汞泄漏的问题，考虑换LED灯，amazon上最便宜的都要8
块多一个，去淘宝上一搜，人民币都只要3块多？为啥差别这么大？美国有便宜的LED灯
泡卖么？ | M****u
发帖数: 17708 | 2 便宜没好货
要8
【在 o****e 的大作中提到】
: 据说普通的节能灯泡有紫外线和汞泄漏的问题，考虑换LED灯，amazon上最便宜的都要8
: 块多一个，去淘宝上一搜，人民币都只要3块多？为啥差别这么大？美国有便宜的LED灯
: 泡卖么？
| p**********g
发帖数: 9558 | 3 所以我在不停的找便宜的好货
【在 M****u 的大作中提到】
: 便宜没好货
:
: 要8
| M****u
发帖数: 17708 | 4 你那不叫便宜，叫abuse，轰低泡要把你照片挂门口了
【在 p**********g 的大作中提到】
: 所以我在不停的找便宜的好货
| p**********g
发帖数: 9558 | 5 切，我买的明明是deal好不好
【在 M****u 的大作中提到】
: 你那不叫便宜，叫abuse，轰低泡要把你照片挂门口了
| c****e
发帖数: 749 | 6 不光是省电的问题。还有温度值和CRI。CRI 90以上比较好。
要8
【在 o****e 的大作中提到】
: 据说普通的节能灯泡有紫外线和汞泄漏的问题，考虑换LED灯，amazon上最便宜的都要8
: 块多一个，去淘宝上一搜，人民币都只要3块多？为啥差别这么大？美国有便宜的LED灯
: 泡卖么？
| t*****e
发帖数: 15794 | 7 看篇好文
March 21, 2013, 3:15 pm 285 Comments
Addressing Fears About LED Light Bulbs
In my Times column Thursday, I reviewed a new generation of LED light bulbs.
They last 25 times as long as regular bulbs, use maybe one-eighth the
electricity, work with dimmers, turn on instantly to full brightness and
remain cool to the touch. A big drawback has always been cost, but now, I
noted, the prices have fallen.
This column generated a lot of reader e-mail, probably because LED
represents change. And change is always scary. Here are some excerpts, with
my responses.
The Times’s technology columnist, David Pogue, keeps you on top of the
industry in his free, weekly e-mail newsletter.
Sign up | See Sample
* For LED bulbs, the biggest issue that most consumers will notice is the
color. You correctly point out that you can get different colors, and also
different shades of white, from warm white, to cool white, to daylight.
However, not all white is the same. Two bulbs, both of which measure 2700K (
warm white) color may create a completely different impression in the room.
The difference is C.R.I. (Color Rendering Index). Incandescent bulbs have a
C.R.I. of 100. Really bad LEDs have a C.R.I. of 50; average ones (most of
them) have a C.R.I. of 80 to 85. The really good ones have C.R.I.’s above
90.
C.R.I. is a way of expressing how many colors in the rainbow are actually
contained in the white light. Incandescent bulbs contain every color in the
rainbow, all in equal measure.
With LED bulbs that have low C.R.I.’s, the color of objects looks wrong,
and everything “feels” ghostly. It is not a subtle effect.
Wow. Well, I’d never heard of C.R.I., and it certainly isn’t listed on the
package.
I can say only that I’m completely happy with the light color of the Cree
bulbs. They look nothing like the weak, diluted light of the compact
fluorescents they’re going to replace. I don’t perceive anything ghostly
or wrong about them.
But if you’re worried about C.R.I, maybe try out one bulb at home before
you replace the whole house’s bulbs.
* Why I don’t have LED bulbs: I have yet to see one that puts out close to
the same lumens of an incandescent bulb rated at 75 or 100 watts offered for
sale in my area.
Many of you made this point: that the 40- and 60-watt bulbs I reviewed are
not bright enough for aging eyes, reading, detail work and so on.
That really is a good point. You can buy 75- and 100-watt-equivalent LED
bulbs — online, they’re plentiful — but they’re still expensive ($30 to
$45 each).
* At my home, CFLs don’t last half as long as stated on the box, and when
CFL electronics flame out, they leave that nasty burnt electronics smell,
strongly disliked by my wife. A few friends have reported CFL flame outs
that have set things on fire.
Sorry to hear that! However, my column was about LED lights, not compact
fluorescent light bulbs. Compact flourescents are basically curlicue tubes
filled with gas that lights up. LED bulbs use tiny light-emitting diodes, of
the type you have seen in some flashlights and the “flashes” of
smartphones.
* Why didn’t you write up the LIFX bulbs on Kickstarter? Are you some kind
of paid shill for the light-bulb industry?
Mainly, because I hadn’t heard about LIFX bulbs. Now I have!
Looks like it’s a lot like the Philips Hue kit I reviewed, in that these
are LED bulbs you can control from a phone app: brightness, timing and color
. The beauty of LIFX, though, is that there’s no router box required. The
networking electronics are right in the bulb.
And the LIFX does more, too: changes color in time to the music, for example
, or notifies you when you have new e-mail.
These bulbs did super-well on Kickstarter, so they’ve obviously captured
the public’s imagination. I’m in touch with the creators, and they’ve
promised to send me one to try out when it becomes available!
* You have done what many before have done: Praise LED light bulbs —
without touching on the quality of light.
It doesn’t matter whether the light bulb is $200 or 50 cents. If the light
is ugly, and it hurts your eyes to read, then why should I buy it?
Compact fluorescent lights have an austere blue tinge. Some give a “warmer
” shade of yellow. But the quality of light they produce is atrocious.
I did, in fact, mention the quality of light; in my opinion, it’s wonderful
. You can choose “daylight” (whiter) or “warmer” (yellower). With some,
like the Philips, you can dial up any color you like: white with a touch of
blue or yellow, say.
But I’m not sure why we keep talking about compact fluorescent lights. LED
technology is completely different. There is zero relationship between a
compact fluorescent light bulb’s light quality and LED’s light quality.
* You neglected an important point: because of heat issues, you’re not
supposed to put LED bulbs into enclosed fixtures, like ceiling “cans.”
Actually, I asked Cree specifically about this. The representative says the
bulbs are fine in ceiling cans. “The Cree LED bulb can be used in any
application that would use an incandescent bulb. As long as there is an
opportunity for air to circulate, the bulb is designed to work properly.”
I’m aware that not all bulbs meet this criterion; I’ve seen warnings on 3M
and Philips bulbs, for example, not to use them in ceiling cans.
* Is there a potential issue with RF (radio frequency) interference from the
circuitry? I know someone who put the LED bulbs in his garage door opener
and then had trouble with the remote control.
I didn’t experience any in my testing. And I do have garage-door openers.
* Not meaning to be a total Luddite, I must ask: transmitter, to plug into
my network router? Really? Is it REALLY necessary to waste time and expense
to plug a LIGHT BULB in to the Internet?
I understand that both incandescent light bulbs and candles are still
available at many fine housewares retailers.
要8
【在 o****e 的大作中提到】
: 据说普通的节能灯泡有紫外线和汞泄漏的问题，考虑换LED灯，amazon上最便宜的都要8
: 块多一个，去淘宝上一搜，人民币都只要3块多？为啥差别这么大？美国有便宜的LED灯
: 泡卖么？
| s**********d
发帖数: 36899 | 8 这个文章完全误导啊，还好文。
白纸灯CRI = 100，你认为你白纸灯下跟日光下看得一样吗？
这个index的定义是跟同样色温的黑体辐射比。白纸灯色温只有2700K,
CRI 100也是黄的，蓝色根本不能正常表现。
一个色温5000K CRI 90的灯几乎肯定比100的白纸灯颜色好。
【在 t*****e 的大作中提到】
: 看篇好文
: March 21, 2013, 3:15 pm 285 Comments
: Addressing Fears About LED Light Bulbs
: In my Times column Thursday, I reviewed a new generation of LED light bulbs.
: They last 25 times as long as regular bulbs, use maybe one-eighth the
: electricity, work with dimmers, turn on instantly to full brightness and
: remain cool to the touch. A big drawback has always been cost, but now, I
: noted, the prices have fallen.
: This column generated a lot of reader e-mail, probably because LED
: represents change. And change is always scary. Here are some excerpts, with
| F********y
发帖数: 7139 | 9 Costco的led灯便宜而且退货方便，买几个回来试下就好了 | g*******t
发帖数: 7704 | 10 led灯功率不足，只能用普通地方，
大功率led还是瓶颈， | w********r
发帖数: 8704 | 11 也要看人吧，偶觉的3000k左右的soft white最舒服
【在 s**********d 的大作中提到】
: 这个文章完全误导啊，还好文。
: 白纸灯CRI = 100，你认为你白纸灯下跟日光下看得一样吗？
: 这个index的定义是跟同样色温的黑体辐射比。白纸灯色温只有2700K,
: CRI 100也是黄的，蓝色根本不能正常表现。
: 一个色温5000K CRI 90的灯几乎肯定比100的白纸灯颜色好。
| y****a
发帖数: 1140 | 12 马鬃上也有便宜的，这个看质量吧，当让乒乓都是买的物美价廉的
http://www.amazon.com/exec/obidos/ASIN/B007POATV4/highly-rated-
要8
【在 o****e 的大作中提到】
: 据说普通的节能灯泡有紫外线和汞泄漏的问题，考虑换LED灯，amazon上最便宜的都要8
: 块多一个，去淘宝上一搜，人民币都只要3块多？为啥差别这么大？美国有便宜的LED灯
: 泡卖么？
| o****e
发帖数: 916 | 13 Toro 51609 Ultra 12 amp Variable-Speed (up to 235) Electric Blower/Vacuum
with Metal Impeller？
链接好像不对啊？谢谢
【在 y****a 的大作中提到】
: 马鬃上也有便宜的，这个看质量吧，当让乒乓都是买的物美价廉的
: http://www.amazon.com/exec/obidos/ASIN/B007POATV4/highly-rated-
:
: 要8
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