Long term test (life) of a bulb LED Sirius

[izentrop]

6048 / 24 = 252 days and about 8 months

It is not 100% HS but its light output is very low (20% -30% of the original power to the eye)

Maybe not down then?

[Christophe]

So here are the pictures of disassembly of this LED bulb

Disassembly is very easy: the base is unscrewed in the body of the bulb (aluminum). The latter serves as heat sink circuit that contains the led (by simple touch), I voluntarily disassembled the LED side to show you.

The transformer part has warmed here and thereit's hard to say where the problem would be in the state: there are more than a dozen hot spots ... and no condenser has exploded or sunk ...

I liked the integrated setting possible (output voltage to blow on), so much to do I'll boost it a little

Here are the photos, I left the bulb "in its own juice" with insects and spider webs to show you its condition and age, the plastic of the base has also yellowed well.

Insects in the lantern

Details of the heating points on the LED transformer

Details of the heating points on the LED transformer

Details of the heating points on the LED transformer

Transformer "front" side

Transformer side "back", it heated anyway ...

The bulb "in its own juice"

Easy disassembly :)

Details on the passive cooling system of the LEDs

The plastic part simply clips

[izentrop]

It's serious with constant current power supply based on the http://www.clare.com/home/pdfs.nsf/www/ ... HV9910.pdf
Looks like the diagram on the 8 page

Does not seem to have heated, looks like solder stripper or something that has leaked on the circuit or varnish.
To begin, clean the circuit with 90 ° alcohol and a toothbrush;)

[Christophe]

So here are the measurements of the voltage at the terminals of the LED circuit: (With visible terminals, very easy so: frankly I think there is no better side LED bulb design for testing ... I chose the model lol)

a) flash ignition: 18-19V (what I see on the voltmeter) after that fall under the 11V and it gradually rises to stabilize at about 11.4V, I presume that it was originally 24V (Besides there is an indication 24V on the plate)

b) AC voltage measurement gives 0.88V for continuous 11.4V (this can help to diagnose an HS transformer)

Finally, after closer examination, the LEDs may be worn too, here is a photo in detail and some of them flicker (as you suspected Izentrop). Each LED is made up of 3 light points and some only have 1 that lights up. It also lacks a bit of "coating". Each LED is in a "soft" material ... a kind of silicone.

I will connect the LED circuit to a stabilized power supply 24V and redo a photo of the LEDs ... to see if it comes from the LEDs or the transformer. It is possible, given the state of some LEDs, that it also comes LEDs ...

[izentrop]

18 A 24 V regulated current.
24V empty, leds unplugged.

You risk burning them with your power supply, put a series resistance of ten ohm to limit the current to 0.2 A.

There must be shorted LEDs.

[Christophe]

Here are better photos to see the difference in brightness of each LED.

I have better tuned the camera, and owl: we see 3 straps on each LED invisible to the naked eye! (hence the "silicone" protection).

These pictures of details are a little Jules Vernesque no?

LED bulb detail after 80 000h

LED bulb detail after 80 000h

LED bulb detail after 80 000h

LED bulb detail after 80 000h

[Christophe]

You risk burning them with your power supply, put a series resistance of ten ohm to limit the current to 0.2 A.

It is a laboratory supply, stabilized and adjustable, I will go gradually ...

[Christophe]

I just came back from the "lab".

Already I found 3 other ampoules of the same model in SAV that I had not thrown since those years! (there is a variant among the 4), in the background, the 80 000h.

a) The plastic of the cap was not white but gray (just to show you that the 80 000h bulb actually turned 80 000h outdoors):

b) Voltage rise tests (this starts to light up from 12V). I did this test on a LED circuit of one of the SAV bulb and which already had some LED HS step 2V: 12V, 14V, 16V, 18V, 20V ...
Towards the 20V we are close to the optimum brightness. This had to be set originally between 18 and 20V.

From 20V the LEDs start to flicker.
At 25V they start to burn and smoke ... oops ...

After this voltage surge: even those who have not burned have their brightness greatly reduced, whatever the voltage ...

Photos:

Brightness at 12V

A 14V

A 16V

After the photos do not show anything significant anymore.

At the voltage / amp level we have:

I then connected the 80 bulb 000h starting at 12V and step 2V.
Well it does not go up in brightness (they illuminate less than the 1er LEDS tests before exceeding the 25V).
And they react as if it had exceeded the 25V (led overvoltage = non-destructive premature wear?).

Conclusion: it is indeed the LEDS which are out of order in the case of the 80h bulb and not the transformer (well it is also maybe) ...

Something that I do not explain well yet: it is the flash when starting the bulb 80 000h ... surely a history of internal physics LEDs .. (this flash does not appear when we start 12V)

[Obamot]

What matters is the temperature of abuse ^^

[izentrop]

Something that I do not explain well yet: it is the flash when starting the bulb 80 000h ...

I think it's the reaction time of the regulator. As you have a series of leds in short circuit, it regulates the current with delay.

If led unplugged the power supply of the bulb comes out 24 V (so empty so) it should still be good.