New Light bulb on it's way.

With all the recent talk on light bulbs, here is a low energy light bulb with no mercury and its clever.

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mark
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Reply to
Huge

"Goal price £20"

Reply to
EricP

I followed this through a number of websites and found the whole topic very interesting.

What I hadn't realised, if you google on Luxeon, is that they now have LED's that are taking 1A plus. A quick run down some of the spec sheets, then lead me on to find out how many lumens an incandescent bulb produces as typically some of these high power leds are producing

170 lumens at 700mA. I found out from Wikipedia that a 100W bulb produces 1700 lumens which means that a led equivalent requires 10 of these leds which is 7A typical - OK this is at a couple of volts so the power is quite low, but it does mean that we are going to have to face some pretty powerful switching transformers (more electronic noise) scattered around our houses, and what is more of a concern is that we will have to rewire with automobile grade wiring - low voltage insulation but lots of copper !!

As usual, we do get nothing for nothing and it's all very well the pundits telling us that the next generation of lighting will be the ultimate solution in terms of cost and efficiency but as is all too common the whole picture has not been presented.

Rob

Reply to
robgraham

Work in progress. Most of that page describes bullet-point "patent" design ideals.

No-where does it describe the new technology to replace filament / discharge lighting with equivalent optical output with energy saving.

Currently set up as a prototype there's a significant amount of integration to be performed before it could become remotely viable, and even then without the new technology to provide effective lighting levels, it's a dead-duck.

A brave investment opportunity, to be sure. In the mean-time, I'll continue stock-piling GU10s.

Reply to
Mike Dodd

I think if you read the website properly, you will see that the target market is not the average home but those where there is someone at risk as the light is integrated with a thermal sensor to detect non-movement of an IR producing body. As such therefore the market is one in which the purchaser of the 'lamp', typically a local authority, will be able to move the lamp from house to house where there is someone at risk. In that context the =A320 is not unreasonable.

I'm not related in anyway to the original 'spamming' mail but do get irritated by posters who do not read posts carefully, and take in what is actually being said

Rob

Reply to
robgraham

10 x 700mA LEDs wired in series is still only 700mA and 20V or so.

Archie

Reply to
Archie

The big problem with LED light output figures are that they are quoted at a junction temperature of 25C. Above this, light output drops significantly and the life of the LEDs drop significantly. To achieve a junction temperature of 25C in something the size of a 100W GLS lamp with comparable light output and passive cooling, you'd probably have to be operating it at something like -100C ambient in a well ventilated fitting. That pretty much kills LED lighting in the retrofit replacement lamp marketplace. Once you go up to larger light sources which stand some chance of dissipating the heat and remaining cooler, you're in the territory of fluorescent tubes, and LEDs can't compete there.

I think they'll retain the niche they now have, but unless there's a breakthrough that allows operation at much higher temperatures or very much higher efficiency (which probably implies phosphor-less operation), I don't see them replacing compact light sources such as GU10 and MR16 halogens. Commercially, these have already been replaced with metal halide anyway, and that will probably move into the domestic market soon.

Reply to
Andrew Gabriel

They produce a perfectly horrible light though - far worse than a CFL. That might get sorted in time - but likely not.

Reply to
Dave Plowman (News)

10 in series would still only take 700ma, assuming your couple of volts, that would be at 20 volts. 14w. A constant current 700ma SMPS, not dissimilar to a nicad charger would be ideal to drive them, and 700ma wouldn't need heavy cable.
Reply to
<me9

Ok, for what it's worth, I did read the whole of the first page, and the link on the page to the prototype.

I'll rise to the post. The vast majority of recent posts talking about new lighting technology, as referred to by the OP is related to lighting efficiency.

The site suggests that the bulb will be a replacement for standard bulbs ("retrofit"), and so the implication is that it is an equivalent to a standard bulb. Create a viable low-energy bulb, however, and there's a significant market.

The is still the very real problem that the "inventor" has yet to integrate a thermal imaging device, together with LED technology that will generate significant heat on the same substrate, integrate this with a microprocessor (why not an ASIC?), develop the software, test and get to market, for what is a very limited market. Draw in the development costs of all that, and the true market and life of the item, and tell me that it's commercially viable at £20 a pop?

It's a idea. That idea has been patented (well, patent applied for), but it is far, far from being realised as a product.

Reply if you must, but I shall not.

Reply to
Mike Dodd

Some people seem to think that's coming soon:

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Reply to
Andy Wade

Its a joke, the picture is of a commodity ES multi 5mm LED lamp, then talks of using Lumileds LEDs. Integrating a PIR, have a 3 LED light sitting here with a PIR , 3.99 from Lidl couple of weeks back.

As to LEDs being stuck in a niche, thermal management and die to sink transfer is getting better, so they are getting used :

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Reply to
Adam Aglionby

"perfectly horrible" is a subjective value judgement, it isn't everyone's opinion.

We replaced spot halogens on our landing, which lit large oil paintings in the stairwell and effectively lit the landing, with LEDs - which give a very pleasing (to us) 'moonlight' quality to the lighting. It's perfectly acceptable in that situation and is far more 'natural' than either tungsten or halogen.

By the way, they were very cheap - from Lidl or Aldi.

Mary

Reply to
Mary Fisher

I know it's not really done to comment on grammar, especially here where we're more concerned with imparting information than how that information is imparted, but it must have taken some sort of cognitive process to put the apostrophe incorrectly in the possessive "its" in the subject line, but to have incorrectly omitted it in the contraction of "it is" in the message body.

I find the usenet group alt.possessive.its.has.no.apostrophe useful in this regard.

Reply to
edwardwill

Even worse for this purpose. I doubt the artist spent all that time carefully choosing colours just to have them ruined by crappy lighting.

No it's not. LEDs give nothing close to any natural light.

Was that the oil paintings?

Reply to
Dave Plowman (News)

I emailed the 'inventor' to query why not an ASIC and got back this reply:

Quote: Re: why don't I use a ASIC, I use a microcontroller so new software can be downloaded to upgrade the lightbulb, into it's flash memory. ASICs are fixed for life.

Also PIRs cannot measure precise temperature at a distance, thermopiles can measure to an accuracy of 1 C or less

mark

Reply to
mark

Thank you for that! I do know how to use apostrophes but haste can cause a malfunction in their application. Good job we've got you to monitor. 'How to Win Friends and Influence People', is not on your bookshelf I take it?

mark

Reply to
mark

Why do they need such accuracy ? And even so waiting for the body temperature to drop by 1C would probably mean the person is dead by the time the bulb responds, and what then. They'd be better oof puttingin a wireless link to an alarm. I think these LED lights would be good in a toilet/bathroom. I wouldn't have to find the pull cord when pissed as I entered the bathroom, and I might even be able to find the toilet if the light came on otherwose I'd end up just aiming in the general direction ;-) I've actually though about placing LEDs in teh tiolet bowl at night as something to aim at, but keeping them cleam is a problem, so maybe I need to mount them in/under the bowl somehow.

Reply to
whisky-dave

It's not crappy - and the artist knows how they're lit and approves. It gives an added dimension.

Reply to
Mary Fisher

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