Is it possible to replace this LED chip within a luminaire?

[Adsibob]

We have a flush mounted ceiling light that produces 1480 lumens at 3000K. It has a module inside it which acts as a presence sensor so it comes on when people walk into the room, and switches off a certain number of minutes afterwards. There is also another module inside, branded Siteco, which is the LED driver. After almost 4 years of regular use (at least a few on/off cycles a day) it has started to flicker. The flickering is worst when first coming on in a day; after that it’s sometimes a bit better, depending how long between activations. I attach some photos. I searched for replacement circular LED chips using the model codes on the circular chip itself, but had no luck. Can’t believe I need to replace the whole unit when it’s just the LED chip which is dying. 
any ideas?

 

 

[ProDave]

Can you post a closer picture of the Sireco module.  Even if I zoom in, it is too fuzzy to read the numbers.

[Temp]

It's unlikely to be the LED boards themselves unless they have more electronics on them we can't see.. More likely the driver module or capacitors in it.

[Adsibob]

1 hour ago, ProDave said:

Can you post a closer picture of the Sireco module.  Even if I zoom in, it is too fuzzy to read the numbers.

[Adsibob]

1 hour ago, Temp said:

It's unlikely to be the LED boards themselves unless they have more electronics on them we can't see.. More likely the driver module or capacitors in it.

Why do you say that @Temp? Because of the flickering symptom?

[ProDave]

Most likely to be the driver.

 

Trouble is I can't find that exact driver anywhere.  The important thing is you want a constant current driver set at 145mA or an adjustable one that can be set to that.  Most I have found are 300mA or more.  Then it has to be small enough to fit in the space occupied by that one.

 

If it were mine, I would open up the case of that driver which may involve cutting it open of the plastic is welded or glued shut.  Like @Temp my money is on a failed capacitor or 2 which is probably repairable.  Even if you then had to glue the case of the driver back together.

 

P.S the U Out 340V DC makes one not trust much of what is written on it.

[Adsibob]

29 minutes ago, ProDave said:

Most likely to be the driver.

 

Trouble is I can't find that exact driver anywhere.  The important thing is you want a constant current driver set at 145mA or an adjustable one that can be set to that.  Most I have found are 300mA or more.  Then it has to be small enough to fit in the space occupied by that one.

Thanks. The external diameter of the LED ring is about 20cm and the internal diameter is about 10cm. 

29 minutes ago, ProDave said:

 

If it were mine, I would open up the case of that driver which may involve cutting it open of the plastic is welded or glued shut.  Like @Temp my money is on a failed capacitor or 2 which is probably repairable.  Even if you then had to glue the case of the driver back together.

But how would I work out which capacitor. If any welding is required, that rules me out.

29 minutes ago, ProDave said:

 

P.S the U Out 340V DC makes one not trust much of what is written on it.

Interesting… even for Siteco modules? I thought they were a reputable company.

 

 Other option I have is to buy a driver and LED chip pair, that way I know they are compatible with eachother. Though shame to waste money on replacing the led chip given that it’s still working.

[ProDave]

They may be a reputable company for complete light fittings, but I have not found spares on sale anywhere yet.

 

Perhaps try contacting Siteco directly and asking them if they can supply you with a new driver?

[Alan Ambrose]

Probably the item that failed is the driver and agree the easiest method might be to ask Siteco. What's the Merrytek bit though? Some kind of presence sensor or Dali thing? It's possible, but less likely, that that has failed rather than the driver. A remote possibility is finding a constant current driver of roughly the same spec that will fit physically.

[Temp]

On 03/01/2026 at 17:11, Adsibob said:

Why do you say that @Temp? Because of the flickering symptom?

 

Past experience. LED themselves are pretty reliable. Drivers on the other hand tend to be crammed into a little box with minimal cooling. Some types of capacitor are particularly sensitive to temperature with their expected life halving by every 10C rise above about 40C.

 

 

 

 

[Adsibob]

On 04/01/2026 at 17:51, Alan Ambrose said:

What's the Merrytek bit though? Some kind of presence sensor

Yes, it’sa presence sensor. That appears to be working just fine, in that the light still comes on when it’s meant to and stays on for the amount of time it’s meant to. 

[joth]

One thing I'd add is the secondary (output) side of the driver must be 150V d.c. or so, which is definitely not SELV and enough to give a fair belt. So take care handling it and maybe one reason replacement driver would be hard to find. 

 

Do you know how many watts the fitting (i.e. The LEDs themselves) is rated as?

Here's a 150mA driver which will be fine current wise, but only 6.3W which is likely (but not obviously) too low

https://www.aliexpress.com/item/1005009676981309.html

 

Edit: 12W, maybe getting closer

https://www.aliexpress.com/item/1005008654656151.html

Edited 15 hours ago by joth