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| The Dubai Lamp |
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| amyk:
--- Quote from: MK14 on April 09, 2022, 07:13:15 pm ---Here is a leaflet and advertising webpage, about the Philips ultra efficient LED bulbs: https://www.lighting.philips.co.uk/consumer/ultra-efficient Apparently ( source probably this: https://www.electronicsweekly.com/blogs/led-luminaries/philips-goes-210-lm-w-bulbs-fanfare-done-earlier-2021-08/ but I may have read a number of websites, so it could be elsewhere ), the EU new regulations, as regards the efficiency labeling, is rumored to have persuaded Philips to release these new LED ultra efficient ranges. --- End quote --- The box in the first link still appears to have Arabic text on it, so I suspect this is the same design as the original Dubai lamp... but there's only one way to find out! |
| MK14:
--- Quote from: amyk on April 10, 2022, 07:49:10 pm ---The box in the first link still appears to have Arabic text on it, so I suspect this is the same design as the original Dubai lamp... but there's only one way to find out! --- End quote --- I think I noticed that, as well. I'm hoping to buy a limited quantity (maybe 2 of them) of those bulbs, in around a weeks time, if things go to plan. If I do, I'll try and remember to report back on that arabic text and what I think of them. My theory is that such product advert things, were prepared a very long time ago. So, that 'old'/existing box, was all they had available. So, that was used by the official photographer, to prepare that leaflet. If it needs mass leaflet printing and upper management approval, it could of been 6 months (I'm guessing) or more, before the product was really ready. I.e. The actual box for sale, may not look iike that, anyway I hope to buy one/some, fairly soon, so I can find out for sure. Also, many products these days, are for highly global markets, and some boxes do seem to come with a huge number of different (foreign) languages, printed on them. So, that could also be why it has some Arabic writing on it. Although around £12 is rather expensive. Lights which are on most of the time, and especially when difficult to change, are still probably worth using that type, when they next need changing. £12's at the current UK £0.30($0.45 approx), per kilowatt-hour, will pay for itself in electricity savings alone, compared to a normal 60 watt equivalent LED light, so call it approx 3.5 watts saving, every: £12 / ((3.5 / 1,000) x £0.30) = 11,429 hours, which is around 1.5 to 2 years, depending on how often it is left on for. Hopefully, in the future, the price will come down, they will become more available, and perhaps better in other ways (such as being closer to 2700K, if possible, and, as other(s) have said, if it really makes a significant difference). |
| james_s:
--- Quote from: MK14 on April 09, 2022, 11:21:21 pm ---Just in case anyone was interested in what I was talking about before (that broke prematurely, after 1.5 or 2.5 years approx, due to ruptured glass package) is interested in those long life, perhaps (10 years +) 25,000 plus hours life, tungsten filament (incandescent), now relatively old fashioned 40 watt light bulbs. An old packet of them, are reviewed, here: --- End quote --- It's trivial to make an incandescent lamp last tens or even hundreds of thousands of hours, simply run it at a lower voltage than it is designed for, lifespan goes up exponentially as voltage drops. Unfortunately efficiency in terms of lumens per watt falls about as quickly as the lifespan increases. Long life incandescent bulbs have been around for many years, but have a substantial efficiency penalty. A 60W long life bulb is about as bright as a 40W standard bulb. It's even worse in 240V land, 240V incandescent lamps are significantly less efficient than 120V bulbs. |
| MK14:
--- Quote from: james_s on April 11, 2022, 06:56:29 am ---It's trivial to make an incandescent lamp last tens or even hundreds of thousands of hours, simply run it at a lower voltage than it is designed for, lifespan goes up exponentially as voltage drops. Unfortunately efficiency in terms of lumens per watt falls about as quickly as the lifespan increases. Long life incandescent bulbs have been around for many years, but have a substantial efficiency penalty. A 60W long life bulb is about as bright as a 40W standard bulb. It's even worse in 240V land, 240V incandescent lamps are significantly less efficient than 120V bulbs. --- End quote --- I seem to remember being persuaded to buy them, because there was very tempting adverts for them. Claiming they would last for a huge number of hours, perhaps 35,000 hours, with a 20,000 hour rating (numbers very approx, from memory). They were expensive, but seemed a good idea, for any very hard to replace light bulb areas. I can't find the advert from a very long time ago, but there is a modern advert, which is a bit similar, here: https://www.conservastore.com/product/conserve-energy/long-lasting-light-bulbs/longest-lasting-incandescent-light-bulbs/60-watt-frosted-or-clear-long-life-incandescent-light-bulbs-10000-hrs-12-pack/ --- Quote ---60 Watt Long Life Incandescent Light Bulbs 10,000 Hrs, 12 pack $54.00 Some folks just like the look and feel of an incandescent bulb These give you incandescent feel while offering very long life at 10,000 hrs. --- End quote --- The advert really made it seem attractive to buy. Saying something like, "Ever wonder how Airports have so many runway lights, which seem to last a long time. Well Get the same bulbs here, with our special offers. Get the same huge life expectancy that they get with airport runway lights. Buy now, just £25 for a pack of 2 (or 3 or 4 ?), including postage and packing". N.B. I'm trying to remember an advert from perhaps a couple of decades ago, so could easily be wrong, in the finer details. I sought of partially knew that (inefficiency), at the time. But don't think I realized, it was an exponential effect, nor that using much higher rated voltage bulbs (if available), would do the same thing. Without needing to pay sky high prices, for some very long life light bulbs (tungsten filament). Are you sure that 120V incandescent bulbs, are more efficient than 240V directly equivalent bulbs ? Do you have any sources for that information ? It doesn't make a lot of sense. Because a 60 Watt bulb, with the tungsten filament, suitably adjusted for operation on 120V AC or 240V AC, should have roughly the same energy consumption (60 Watts), roughly the same life expectancy (1,000 hours seemed to be a common standard), and as far as I know, the same light output at 60 Watts of heat, assuming the filaments, are broadly compatible. If anything, I thought it was the other way round. The lower the bulb voltage, especially as regards tiny/small very low wattage bulbs. Such as 1.3V Torch Bulbs (1.3V accounts for the significant voltage drop, especially with old Carbon/Zinc Battery technology, from long ago, when such torches were popular), for use with a single 1.5V AA battery. Are usually, significantly worse as regards brightness, bulb burn life and efficiency. Whereas 12V or 24V bulbs, are usually much better. |
| themadhippy:
--- Quote ---Are you sure that 120V incandescent bulbs, are more efficient than 240V directly equivalent bulbs ? Do you have any sources for that information ? --- End quote --- no figures ,just experience of using pairs of 120v par 64's to get more punch from the beam than the equivalent 240v version.I believe its down to the filament being smaller so focuses better at smaller beam widths |
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