LED Lightbulbs

Want to share some knowledge of eco products. Or have you heard about any new eco projects that you want to share with the world?
JT101
Tom Good
Tom Good
Posts: 72
Joined: Wed Jul 13, 2011 12:55 am

LED Lightbulbs

Post: #250749 JT101
Thu Dec 29, 2011 2:35 pm

Just received my new LED lightbulb in the post and am very pleased. Figured not many people have these yet, so check out the future of home lighting on my blog: http://www.thebreadcrumbtrail.org/archives/907

Here's a summary:
I’m happy with my new LED bulb, and only replaced my CFL since it actually blew a couple of weeks ago.
Costs around £10 / bulb, but should save around £50 / year for a typical household if all bulbs replaced, with a payback of 1-2 years and saves around 270Kg CO2. Bulbs last approx 10-20years. Over next few years the cost will come down to pence rather than £’s

User avatar
Carltonian Man
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 575
Joined: Wed Jul 29, 2009 8:29 am
Location: Nottingham

Re: LED Lightbulbs

Post: #250754 Carltonian Man
Thu Dec 29, 2011 4:13 pm

Nice one JT. What colour light do they throw out, ones from a couple of years back were quite a harsh blue and cold looking.

dave45
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 683
Joined: Tue Feb 24, 2009 8:20 pm
Location: Lancashire

Re: LED Lightbulbs

Post: #250770 dave45
Thu Dec 29, 2011 11:36 pm

I'm confused about LEDs now.

I thought they were supposed to be high-efficiency converters of electricity to light (minuscule waste heat). yet most of the devices available were low-power, puny and rubbish. Toys or torches.

Then I came across one of these http://www.ebay.co.uk/itm/20W-High-Powe ... 27c10cdfd4

this is a true high-power device... yet it DEMANDS a heat sink. I tried running it without one, and it burnt my hand... then cells started burning out until I switched it off..

heat => inefficiency...

I am left wondering - is the LED phenomenon a whole bunch of horses**t or what?

tim_n
Tom Good
Tom Good
Posts: 78
Joined: Thu Apr 12, 2007 9:29 am
Location: Ashingdon, UK
Contact:

Re: LED Lightbulbs

Post: #254539 tim_n
Tue Feb 21, 2012 12:03 pm

I've just invested in some G9's and GU10's for the kitchen and some wall lighting.

A few years ago I was looking into LED torches - many of the high powered beams start cold at the right rating and as they warm up their efficiency drops. To combat this, you need a big heatsink to remove excess heat which torches can't carry. LEDs are much more efficient than CFLs and hallogen/incandescent and use up much less electricity but are still inefficient because of the heat they produce. You're not going to get total energy conversion. If you do, let me (and only me) know, I'll come visit and I promise I'll share the patent rights with you. Honest.
Tim_n
http://www.waark.com - allotment and green living blog

User avatar
gregorach
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 885
Joined: Thu Sep 30, 2010 1:53 pm
Location: Edinburgh, Scotland

Re: LED Lightbulbs

Post: #254564 gregorach
Tue Feb 21, 2012 3:12 pm

dave45 wrote:this is a true high-power device... yet it DEMANDS a heat sink. I tried running it without one, and it burnt my hand... then cells started burning out until I switched it off..

heat => inefficiency...

I am left wondering - is the LED phenomenon a whole bunch of horses**t or what?


No, you're just not accounting for the extremely high power density. LED are very small devices, so they can't dissipate waste heat as efficiently as CFLs - so they still need heatsinks, even though they are much more efficient.

Plus, a 20W LED is basically a floodlight - it's equivalent to about 200W of halogen, or about 1000W of incandescent. You trying to illuminate a football pitch or something?
Cheers

Dunc

User avatar
MKG
Site Admin
Site Admin
Posts: 5010
Joined: Fri Mar 07, 2008 5:15 pm
Location: North Notts.

Re: LED Lightbulbs

Post: #255378 MKG
Wed Feb 29, 2012 12:06 am

SMDLightEvolution wrote:The LED phenomenon is a far far cry from horse sh**!

I just bought 10 GU10 LED Light Bulbs at http://www.lightevolution.co.uk. They were about £6 each (making them the cheapest on the internet). Also were really high quality, aluminium casing with glass covers. I only have positive things to say!

I would recommend http://www.lightevolution.co.uk to anyone!


Yes. With a user name like that, you would, wouldn't you?

EDIT: The original post, to save confusion, has been sent into the Limbo which is reserved for spammers.
The secret of life is to aim below the head (With thanks to MMM)

tim_n
Tom Good
Tom Good
Posts: 78
Joined: Thu Apr 12, 2007 9:29 am
Location: Ashingdon, UK
Contact:

Re: LED Lightbulbs

Post: #258419 tim_n
Thu Apr 12, 2012 10:51 am

MKG wrote:
SMDLightEvolution wrote:The LED phenomenon is a far far cry from horse sh**!

I just bought 10 GU10 LED Light Bulbs at http://www.google.co.uk. They were about £6 each (making them the cheapest on the internet). Also were really high quality, aluminium casing with glass covers. I only have positive things to say!

I would recommend http://www.google.co.uk to anyone!


Yes. With a user name like that, you would, wouldn't you?

EDIT: The original post, to save confusion, has been sent into the Limbo which is reserved for spammers.


But preserved in your quote for all to see?
Tim_n
http://www.waark.com - allotment and green living blog

User avatar
Zech
Site Admin
Site Admin
Posts: 857
Joined: Wed Dec 15, 2010 3:05 pm
latitude: 52.36
longitude: -3.84
Location: Mid Wales
Contact:

Re: LED Lightbulbs

Post: #258422 Zech
Thu Apr 12, 2012 10:58 am

tim_n wrote:
MKG wrote:
SMDLightEvolution wrote:The LED phenomenon is a far far cry from horse sh**!

I just bought 10 GU10 LED Light Bulbs at http://www.google.co.uk. They were about £6 each (making them the cheapest on the internet). Also were really high quality, aluminium casing with glass covers. I only have positive things to say!

I would recommend http://www.google.co.uk to anyone!


Yes. With a user name like that, you would, wouldn't you?

EDIT: The original post, to save confusion, has been sent into the Limbo which is reserved for spammers.


But preserved in your quote for all to see?

Not quite. I suspect those links have been subtly edited :lol:
---
Rachel

Take nobody's word for it, especially not mine! If I offer you an ID of something based on a photo, please treat it as a guess, and a starting point for further investigations.

My blog: http://growingthingsandmakingthings.blogspot.com/

oldfella
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 1237
Joined: Tue Jan 22, 2008 3:31 pm
latitude: 44.564
longitude: 0.959
Location: Lot et Garonne France

Re: LED Lightbulbs

Post: #258427 oldfella
Thu Apr 12, 2012 12:04 pm

Just put some Lead light bulbs in, ceiling fell down, can anyone tell me what I did wrong :( :(
I can't do great things, so I do little things with love.

User avatar
southeast-isher
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 1206
Joined: Wed Jul 08, 2009 7:41 pm
Location: Great Britain

Re: LED Lightbulbs

Post: #259024 southeast-isher
Sun Apr 22, 2012 2:45 am


User avatar
baldybloke
Living the good life
Living the good life
Posts: 375
Joined: Sun Mar 06, 2011 12:50 pm
Location: Wiltshire

Re: LED Lightbulbs

Post: #259049 baldybloke
Sun Apr 22, 2012 10:54 am

Lidls occasionally sell LED bulbs and I have replaced the halogen spots in the kitchen with these. Ok they are not as bright but I have got used to them now.
Has anyone seen the plot, I seem to have lost mine?

User avatar
battybird
A selfsufficientish Regular
A selfsufficientish Regular
Posts: 655
Joined: Tue Jul 10, 2007 7:05 pm
Location: Kent / central portugal

Re: LED Lightbulbs

Post: #259084 battybird
Sun Apr 22, 2012 7:07 pm

oldfella wrote:Just put some Lead light bulbs in, ceiling fell down, can anyone tell me what I did wrong :( :(


:lol: :lol:
The cockerel makes the noise, the hen produces the goods!! anon


Return to “Eco Products and Innovations”

Who is online

Users browsing this forum: No registered users and 1 guest