Comments on: Efficient LED Light Bulbs For The Home

By: Exatorp

Exatorp — Mon, 28 Nov 2011 19:52:48 +0000

Replaced all the lights in my home with either 4w spots or 7w ‘golf balls’, or 2w decorative ‘candles’spots cost £9-14 and the golf balls £18. House now used 160w compared to the 1500ish it used previously.

Spots aren’t quite as bright with 360 lumen ouput, but the golf balls with 480 are just fine. Not expecting to change a bulb for another 10+ years now and they will have paid for themselves inside 9 months.

http://www.ledwaves.com/led-calc/

By: Win

Win — Mon, 03 Oct 2011 20:31:27 +0000

I hope you can do testing for LED lights similar to this to show brightness, watts, color temp, color, perceived brightness, faces, reading as parameters.

As for reading light…
according to this
http://www.fullspectrumsolutions.com/cri_explained.htm
http://www.economicallysound.com/lighting_basics_for_your_basic_bulb_purchase.html

The “Ideal” reading light has color temp of 5000-6000Kelvin and CRI close to 100 as much as possible with 1700-2800 lumens.
Here are example of Color temp and CRI…
Incandescent: 2700k 100 CRI
Tungsten Halogen: 3200k 95 CRI
Cool White: 4200k 62 CRI
Natural Sunlight: 5000-6000k 100 CR
Daylight Bulb: 6400k 80 CRI

Are there LED which has a color temp of 5000-6000Kelvin and CRI close to 100 with 1700-2800 lumens?

By: Anonymous

Anonymous — Mon, 03 Oct 2011 20:16:44 +0000

According to this site
http://www.fullspectrumsolutions.com/cri_explained.htm

The “Ideal” Reading light is that of daylight.
To match daylight it should have color temperature of 5000-6000Kelvin AND Color Rendering Index (CRI) as close to 100 as possible.
Here are examples of Color Temperature and CRI…
Incandescent: 2700k 100 CRI
Cool White: 4200k 62 CRI
Natural Sunlight: 5000-6000k 100 CRI
Daylight Bulb: 6400k 80 CRI

Are there LED lights which have 5000-6000K and CRI close to 100?

By: Win

Win — Mon, 03 Oct 2011 17:45:56 +0000

I am looking for an LED light which is like the “daylight” type of CFL used for reading. (not the desklamp type of LED but the one you put on the ceiling) It is for the study room which has white color paint all around about 15 x 15 x 15 feet in dimension.
I would like to inquire what type of LED lighting I can use for reading?

Win

By: Ganghuiled anna

Ganghuiled anna — Fri, 02 Sep 2011 07:38:01 +0000

LED lights will be the best choice for you if you want to buy ligts.
Why I do so,now let me give you a example why I would personally go for 240 watts over 1000.If I use led for a 24 hour diner with a sign burning 24 hours a day.The 100 watt bulb would use 2400 watts of electricity a day,but the 24 watt LED bulb would only use 480 watts and gives a much brighter glow. So it can help you save many money.

By: LED LIGHT BULBS | Kitchen Hoods

LED LIGHT BULBS | Kitchen Hoods — Thu, 28 Jul 2011 14:43:49 +0000

[...] led light bulbs metaefficient.com [...]

By: Ron B

Ron B — Fri, 17 Jun 2011 01:43:39 +0000

Prices and availability are getting better, now yuo can buy some at home depot and walmart, i have been useing some small ones for over 2 years now , as I use solar power I need all the energy saving I can get. since I dont have a large array.

By: Anonymous

Anonymous — Tue, 22 Mar 2011 05:37:21 +0000

I bought 2 leds off of ebay a few yrs ago they worked for a couple of months and burnt out but i think both of them were enclosed and i didn’t know any better i have 3 more coming for my dimmable fan that currently have incandescent bulbs. Ive had an led in my fridge for about a yr now though with out any problems. I guess the oven dryver or the microwave wouldn’t be a good place for led bulbs. So the temp problem eliminates LED and i would assume OLED down the road as an end all solution. Meaning factories cant gear up for one solution which will make getting prices lower, more difficult. I think until the factories really gear up they will remain at least some what expensive and they will remain unused. If we could get the price down to ever 20 to 30 a bulb we might actually be getting somewhere. But like everything else it will take time and require peeps to make some changes and to be more educated.

By: New Luminescent Bulbs May Outshine LEDs and Fluorescents | Drop Your Energy Bill

Thu, 10 Feb 2011 23:31:45 +0000

[...] Energy efficiency compared to an LED though is still in question. The VU1 bulb produces 30 lumens per watt, the equivalent of a 65 watt incandescent. LED technology continues to advance rapidly with some LEDs producing 3 times that many lumens per watt. And the LED holds the top spot when it comes to longevity. The VU1 bulb lasts 10,000 hours, while LEDs average 40,000-60,000 hours. Check out our guide to LEDs here. [...]

By: Felix

Felix — Mon, 20 Dec 2010 04:58:12 +0000

I’d like to know if there is the one that replaces the 100 watt incandescent bulb. I also want to know the price because I want to buy at least 15 or 20.