LED driver requirements

[scarz3]

Hello,

I’m having trouble choosing a compatible LED driver to power this LED strip.

Originally I used this driver, the LEDs were very bright but the strip became very hot and burnt out the LEDs very quickly. The website stated this was 60w output, and the ratings all seem to match the LED strip.

Then I tried using this driver with a new LED strip, which is approx half the amp rating of the previous driver, but it was very dim, almost not lighting up at all.

Can anyone suggest what rating of driver needs to be used?

Many thanks.

 

[DetlefSchmitz]

Never got involved with constant current led lamps, but it says it needs at least 55V and I understand that a nominal 700mA is usual for these.

 

[bernardgreen]

Are you fixing the strip to a heat sink ?

Both the data sheet and application notes ( www.lumileds.com/uploads/359/AB103-pdf ) suggest the strip would have to be derated significantly if not in good thermal contact with a suitable heat sink.

 

[scarz3]

Are you fixing the strip to a heat sink ?

Both the data sheet and application notes ( www.lumileds.com/uploads/359/AB103-pdf ) suggest the strip would have to be derated significantly if not in good thermal contact with a suitable heat sink.

This is how it was fitted.

 

[333rocky333]

Where did you buy the strip, do you have more details for that.
Looks to me like a section cut off a longer section, the 55v reference was likely for the whole strip and you cannot just cut it shorter, it looks like a Constant current strip.
You may be better with a constant voltage strip, that can be cut and you can get 12 or 24 volt versions

 

[scarz3]

Where did you buy the strip, do you have more details for that.
Looks to me like a section cut off a longer section, the 55v reference was likely for the whole strip and you cannot just cut it shorter, it looks like a Constant current strip.
You may be better with a constant voltage strip, that can be cut and you can get 12 or 24 volt versions

Here is the product from RS.
https://uk.rs-online.com/mobile/p/led-linear-arrays/9033018/

 

[bernardgreen]

That fixing provides no effective heat sinking at all.....

Each of the five LED modules is creating 10 watts of heat and this heat has to removed by an effective heat sink.

The holes in the PCB are there to enable the PCB to be mounted to a heatsink that can disipate the 50 watts of heat to prevent the LED modules from over heating.

At the very least all the holes marked red should have a screw to the heat sink and preferable also those marked in green.

The other holes in the PCB are thermal paths to take the heat from the top side of the PCB though to the under side and thus to the heat sink.


The heat sink will probably need to be something like this https://uk.rs-online.com/web/p/heatsinks/9033166/

 

[flameport]

Here is the product from RS.
https://uk.rs-online.com/mobile/p/led-linear-arrays/9033018/

That is intended for use by lighting manufacturers to be part of a larger product, which would be designed specifically for that particular LED strip and have thermal characteristics suitable for the LEDs, and a fully enclosed design to avoid people or objects touching the LEDs, driver or wiring.

Whatever you are intending to do, this is totally the wrong thing to be using.

 

[ban-all-sheds]

Here's something else wrong:

 

[scarz3]

Here's something else wrong:

View attachment 151019

That is because I have disconnected it.

 

[ban-all-sheds]

That is because I have disconnected it.

Where was that connector block before? I can't see any enclosures within the distance the cables would reach....

 

[scarz3]

Where was that connector block before? I can't see any enclosures within the distance the cables would reach....

It was connecting the incoming supply cable to the driver.... the wire is out because I disconnected it.

 

[ban-all-sheds]

FGS.

Where was that connector block before you disconnected one of the cables?

 

[scarz3]

FGS.

Where was that connector block before you disconnected one of the cables?

Exactly where it is now! That setup is enclosed behind a cover, it’s not exposed.

 

[ban-all-sheds]

OK