General > General Technical Chat
Explain to me the (de?)-evolution of LED lightbulb technology
MK14:
My understanding is that one single country, has introduced a law, so that the only Led bulbs allowed, are extremely long life (I'm NOT sure of the exact rules/law, so this could be WRONG), super efficient ones. So, seeing an opportunity, the manufacture(s) have produced such Led bulbs. But ONLY allow them to be sold in that particular country.
BigClive found out about this, managed to obtain such Led bulbs and has done teardowns, reverse engineered schematics and measurements of 'our' Led bulbs vs those much better ones.
I suspect, they don't even cost that much more to produce, so hopefully sell for reasonable prices.
Essentially, they seem to have just doubled (or even tripled/quadrupled or more) the number of Leds, halved/quartered (approx) the current, and presumably/hopefully under-stress/underrate the power components, so that they can last perhaps 35,000 .. 50,000+ hours, at a guess.
madires:
Yep, those Dubai LED lamps are designed well. It's a pity we can't buy them easily outside of Dubai.
coppice:
People like compact lights, and lights that fit into traditional sockets. That usually means some parts are being roasted, especially if the lamp is used inside an enclosed luminaire. Its not the electrical stresses that kill the current cheap LEDs. Its mostly the thermal stresses.
TimNJ:
I love the filament bulbs, just wondering how we get away with a tiny 6x12mm or 8x12mm electrolytic cap in the base + some dinky looking diode bridge, while 5 years ago, the average LED light bulb had some monster 10x16mm cap, inductors, MOSFETs, all sorts of control stuff. We just don't need it anymore? Much better integration with new control ICs? In the early days companies were taking a much more old skool approach to doing constant current driver from mains?
I've seen (I think electronupdate) do a filament bulb life test and they seem just as capable of lasting a long time, all things considered. I'm mainly just wondering where the heck all the control and power conversion circuitry went.
Sal Ammoniac:
I wonder if this race to the bottom price-wise results in LED bulbs that generate lots of RF noise? I wouldn't be surprised at all if it did.
So now we have a product that generates two kinds of pollution: RF pollution and light pollution.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version