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| New LED lights reliability |
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| timelessbeing:
I felt compelled to tear apart a failed bulb I had (a one-way process unfortunately). The thermal design actually seems decent to me. Lots of chunky aluminum. But the power supply is really horrid. The board (the crappiest phenolic resin) was scorched black, and on the verge of crumbling apart. The components look really cheap. Protection consists of a resistor. The LED array looks good too. They used some fancy springy through hole contacts for the connector. The LEDs seem to have gone open circuit unfortunately, so the bulb has pretty much self destructed. It's kind of a shame because overall the construction seems good, and aluminum is not cheap. And it's all crippled because they tried to save a penny on the driver. |
| OwO:
Doesn't matter how good the thermal conductivity from LED to casing is, it's still crippled by the (nonexistent) surface area of that form factor. You will never be able to dissipate >5W of power in that size while keeping the LEDs adequately cooled without a fan. The large rectangular ceiling-mount light fixture design gives you both repairability and good cooling. If a LED fails you can either replace the strip (no soldering needed) or if you want, replace the LED. |
| OwO:
This is the type I'm talking about: Inside there are rows of LED strips screwed to the top aluminum panel, which is screwed to the ceiling. You want to get one with the largest area possible, and space out the LED strips. |
| Siwastaja:
--- Quote from: OwO on February 07, 2019, 09:48:59 am ---Doesn't matter how good the thermal conductivity from LED to casing is, it's still crippled by the (nonexistent) surface area of that form factor. You will never be able to dissipate >5W of power in that size while keeping the LEDs adequately cooled without a fan. --- End quote --- Luckily, there's no need to dissipate over 5W in the E27 bulb form factor. The key to a good design is to use the most efficient LEDs available (the typical variance is around 2x, from around 70 lm/W to about 140 lm/W, so this does matter), combined with an efficient driver. Done this way, a 5W LED bulb emits about 2W of light and heats about 3W, while producing around 500lm, which is what the original fixtures were designed to deliver, and what people expect them to do. |
| Psi:
I put a thinner version of those square panel lights on top of my motorized drop down projector mount. Keeps it nice and hidden away :) |
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