Recessed spot that does not light .. !! ? (scam)? ...

[izentrop]

@Gaston, not guaranteed in 12V

[Did67]

It must depend on the type of power incorporated in the base. If it is a resistance per group of 3 leds as in the led strips, yes, but if it is a constant current power supply,

I think there are two or three elements at play:

a) if the bulb is supplied with 12 V, it is obvious that the risk of "burning" the ballast, in which is located, in a small space, all the transorfmation / rectification / stabilization part of the current 230 V AC to the 'origin. So many elements that can pose a problem. And heat. So many connections / welds that can fail ...

b) provided that the external transformer is very well stabilized and in "stress" not the bulb, a 12 V DC LED will therefore be much less fragile ...

c) It is never strictly speaking the LED which is in question; it is the soldering and the mounting of the LEDs on the "plate" ... and the heat ...

The LEDs that we have everywhere as a "witness" clearly show that it is uncirculated; even those hard disks which "blink" constantly!

[elephant]

We put led's as a warning light on the control panels. Some of those that I rode in my beginnings still "light up" after more than 34 years of continuous service (more than 290.000 h!) (Eg, the mains presence indicators)

However, I think that white LEDs, operated at values ​​closer to their limits will not reach these lifetimes and will suffer degradation, a bit like PV panels (which are nothing other than large diodes)

They will most likely undergo a degradation of their spectrum because their color is obtained from phosphor compounds, a bit like the fluorescent powders of TL.

Personally, given their price, I would already be very happy if they reached 6 to 10.000 hours: the results are much more pleasant than eco lamps.

[Did67]

Yes, I also think that we do not expect 37 years and more ...

But when they click in less than a year, even when it was not too expensive porduits, we still have the feeling of having been had ...

Since then, I still buy some, but "brands" (in the brands, I count Xanlithe or Lexman - the brand of Leroy Merlin)

[r2d2]

sorry, couldn't come back before (am overwhelmed).

I ordered 4 "cold" led spotlights in 9w and 12v.



I absolutely have to understand this story of AC / DC !!!

I am an electromechanic (sorry, I hid it from you wanting to know what the majority knew without being influenced)

I never had to install spots
I know what a led is (in principle it needs "continuous")

and when I see that the seller (s) indicate AC / DC there's something to lose his Latin !!!

Does that mean that rectifier diodes are "drowned" in the base of the spot? ... in this case yes it would be AC ​​/ DC ... I have to clarify this story!

[Did67]

I think, in fact, that the current is "rectified" and "stabilized".

In the 230 V LED ballast, you did transform the current (230 V into 12 V), then rectification and stabilization ... But I do not know in which direction. I think it is easier to rectify 12 V AC, hence this order! But I have never boned and am not competent to "recognize" circuits ...

An LED post is the small plate at the bottom, with the LEDs and behind, the circuits. So you have all the volume of the bulb to put all the mess you need!

[Gaston]

@Gaston, not guaranteed in 12V

Not understood

[r2d2]

DiD67 is not an electrician, but he tries to explain (thank you)

in fact I was talking about the "material" that could be in the base of the led spots (embedded in the spot and therefore not visible)

to get continuous, not much, a diode and a filter capacitor, that's enough to roughly rectify the voltage called AC (12v alternating). so we have a DC voltage
where can be the famous ... "leds AC / DC"

the driver or transformer if you want, it's something else ....
it can have AC / DC voltage rectification system or not.

[Christophe]

I absolutely have to understand this story of AC / DC !!!

Go see this: https://www.econologie.com/forums/transforma ... 10598.html

[Did67]

This is where you approach the question of 12 V AC or 12 DC:

https://www.econologie.com/forums/ampoule-le ... t8772.html