General > General Technical Chat

The Dubai Lamp

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coppice:

--- Quote from: NANDBlog on January 16, 2021, 12:50:01 am ---I had a few early LED laps, with high brightness 5mm LEDs that eventually faded, not providing light at all.

--- End quote ---
In the early 2010s there were a huge number of LED bulbs which faded massively over a few thousand hours. In lighting shops they were refreshing some makes of lamp in the shop displays every three months or so, because their brightness had fallen so much compared to other makes displayed nearby. That issue seems to have greatly improved.

amyk:
What I think is most interesting is that the driver circuitry is very simple - capacitive dropper with a discrete post-regulator. I was expecting it to be based on an IC like a lot of other "high-end" LED bulbs are, but I've heard many stories of the driver failing before the LEDs, so perhaps that is a reliability improvement.

ppelleti:

--- Quote from: coppice on January 15, 2021, 05:06:50 pm ---LED lamps, like CFLs before them, all say they must not be enclosed. Nobody seems to offer a version with better cooling that is suitable for an enclosed luminaire, even though most homes do have several of these.

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LEDs for enclosed fixtures definitely exist.  I have a bunch of them from CREE and they seem to work well.  Unfortunately, it's a little hard to find them at a good price right now, perhaps due to supply chain issues.

elekorsi:
Few weeks ago i took a closer look at an open Thorn IP66 industrial light. http://www.thornlighting.com/en/products/indoor-lighting/industrial-lighting/Aquaforce_Pro
It was interresting to me that the power supply only pushes half of power of what is the LED module strip specified at. I dont remember exact numbers, but i remember it was half. Similar to that dubai led lamps... They sure did make them more reliable and efficent with that.

John B:

--- Quote from: Zero999 on January 15, 2021, 11:35:53 am ---I've toyed with the idea of building my own supper efficient, extra long life LED lamp, but never got round to it. Has anyone here embarked on a such a project?

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I mainly build my own drivers for batten style LED lamps. I'd much rather have several battens run at low power vs a single light bulb or batten at the equivalent power.

Not only do you have LEDs running barely above ambient temps, but the driver circuitry is separate and better able to dissipate heat (which also isn't coupled to the LEDs)

The best thing is the light quality, because there are so many light sources, the room is evenly lit with very little shadows.

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