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Graphene Light Bulbs Coming To Stores Soon
An anonymous reader writes: A light bulb made from graphene — said by its UK developers to be the first commercially viable consumer product using the super-strong carbon — is to go on sale later this year. The dimmable LED bulb with a graphene-coated filament was designed at Manchester University, where the material was discovered in 2004. It is said to cut energy use by 10% and last longer owing to its conductivity. It is expected to be priced lower than current LED bulbs, which cost about £15 (~$22) each.
http://optics.org/news/6/2/6
http://www.nature.com/nmat/jou...
The writer of the original article should be shot, hung, shot, and then boiled.
It is riddled with so many inaccuracies that it's meaningless.
'10%' - yes - 10% is mentioned ' Our first devices already exhibit an extrinsic quantum efficiency of nearly 10% and the emission can be tuned over a wide range of frequencies by appropriately choosing and combining 2D semiconductors'
But going from that to LED efficiency is ridiculous.
It is comedically ridiculous to claim that it's going to result in products this year.
It's worth noting that the best existing 'warm white' LEDs bulbs can already produce about twice as much light per watt as compact florescent.
(if they are made with around double the normal number of LEDs and a more efficient power supply).
I've got a few of the Cree bulbs bought from local big box stores - they work GREAT and the bright white is really white while the warm white looks a great deal like an older incandescent. So happy Cree finally got into the market!
Build it, Drive it, Improve it! Hybridz.org
I just made another post about this, but I have about about 15-16 cree bulbs in my house. I take a picture of the receipt and the packaging at the time of every purchase.
I've had trouble with two--both 40W TW series bulbs. These bulbs flickered--they would turn off and if I adjusted--or even tapped on the bulb--the bulb would come back on for a time. The problem got worse until they barely worked anymore. I thought it was the fixture until I tried one of the bad bulbs in a desk lamp and had the same issue.
Anyway, I emailed Cree tech support with the photo of the receipt and packaging and had 3 new bulbs fedexed to me two days later.
I'm annoyed by the quality lapse (less than a year), but I don't have any problems with their response.
Reduction in prices is not deflation. Deflation is reduction in the money supply.
Deflation often leads to price reductions due to reduction in demand due to reduction in ability to pay as debt servicing becomes more onerous.
Deflation is not a feature of a healthy market for goods as it is not a feature of a market for goods at all, but rather an feature of an unhealthy market for money. You really don't want deflation.
But that's not what they are talking about here. Those "filament" lamps are nothing but a row of LEDs on a strip.
They're probably talking about this, which has nothing to do with filaments: http://optics.org/news/6/2/6