| General > General Technical Chat |
| The Dubai Lamp |
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| thm_w:
--- Quote from: mikerj on April 19, 2022, 09:20:18 pm --- --- Quote from: amyk on April 19, 2022, 12:37:52 am ---That is very odd. Why would Philips decide to design and use a more complex driver circuit, which has the same ~0.5PF as the cap dropper/post-regulator in the original Dubai Lamp, instead of simply giving the original one even better LED filaments --- or just selling that one as-is? --- End quote --- The buck regulator will give flicker free lighting, the same cannot be said for the simple capacitor dropper designs. --- End quote --- The dubai lamp was not a simple capacitive dropper though, to refresh your memory: https://youtu.be/klaJqofCsu4?t=1265 |
| mikerj:
I suppose the buck will be more efficient than the linear regulator. |
| MK14:
--- Quote from: mikerj on April 20, 2022, 01:27:43 pm ---I suppose the buck will be more efficient than the linear regulator. --- End quote --- But also, assuming they are serious/honest/realistic about the 50,000 hour (burn) life. It helps keep the heat (hence lowers component temperature) dissipation down, possibly widens the range of (mains) input voltages the bulb(s) can support, and could reduce warranty claims (early failure). The lamps are potentially worth the £12 (as BigClive mentions), because they are, (apparently) flicker free, very minimalistic energy consumption, very long lamp burn life, great for places where it needs to be on most of the time (e.g. some hall ways), and difficult/hazardous lamp locations. Such as high up on buildings. I hope in the coming future, other suppliers (in addition to John Lewis), will stock those bulbs in the UK. Also, I hope the higher (equivalent) wattage versions, namely 75 watt and 100 watt versions, will also become available (UK). As 60 watts (equivalent) ones, are not necessarily bright enough, for all lighting needs. I'm sort of stating the obvious here. But the current climate of sky high energy prices, and huge interest in big energy savings/efficiencies, would seem to make these new ultra efficient LED bulbs, suited for the big time, mass-market. So I hope Philips do market/sell/stock them, much more widely, than they currently seem to be. I.e. More retailers, advertising, bigger range (40W, 60W, 75W, 100W in UK), and possibly reduce the price, as £12, is rather pricey for LED bulbs. |
| cdev:
In high wage areas I bet long life lower energy bulbs would pay for their higher cost. If they needed far less frequent replacement, for example.. |
| james_s:
The wages are irrelevant, high efficiency lamps do pay for themselves. Even compared to the CFLs they replaced and even with the cheap electricity I have here the early LED bulbs I paid $40 each for paid for themselves in energy savings. Somebody who is very poor may not be able to afford the initial outlay for the efficient lamps but if they could scrape up the money they would pay for themselves in the long run. |
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