Led polarity

[Diagro]

Hey.

Anyone know which tab is what on this 50w led please?




Who thinks this heatsink can handle a 50w led?

 

[Tealc]

No idea. It isn't obvious from the images. I'd look at the data sheet if I were you.

 

[Diagro]

There's no datasheet. If I had one I wouldn't be asking lol

 

[Rozzy85]

If you have a multimetre handy then you can do a continuity test or just test the resistance between the terminals.

 

[Bennie-Mac]

There is a minus on the left side below the hole on the white plastic section of that's of any use?

Edit - positive symbol on the right too, just harder to see.

 

[fornowagain]

The top as you have it in pic is +

Its a bunch of diodes, so will block current wired backwards, i.e it'll only work one way.

Is that heatsink for a cpu or a north-bridge? It puts out a lot more heat than you'd think (yeah ok 50w) but over a small area so make sure you have some air flow on the heatsink or its going to cook.

 

[Diagro]

There is also a plus on the same side at the top

 

[Diagro]

The top as you have it in pic is +

Its a bunch of diodes, so will block current wired backwards, i.e it'll only work one way.

Is that heatsink for a cpu or a north-bridge? It puts out a lot more heat than you'd think (yeah ok 50w) but over a small area so make sure you have some air flow on the heatsink or its going to cook.

You sure its positive at the top? And it wont go pop?

 

[Rroff]

Dunno if its any helpful as the comment doesn't make much sense to me but I saw this on the subject:

"look at the led chip and the side that has the positive is the lead. so when you look at it it will have a little more towards the top and that represents the marked location"

 

[Diagro]

Dunno if its any helpful as the comment doesn't make much sense to me but I saw this on the subject:

"look at the led chip and the side that has the positive is the lead. so when you look at it it will have a little more towards the top and that represents the marked location"

Thanks mate, But that's referring to a normal LED with the two legs where the longer of the two is the Positive

Thanks

 

[Nick1881]

Apply a low voltage very quickly, it won't do any harm the wrong way and the correct way it will light dimmed.

 

[Rroff]

Thanks mate, But that's referring to a normal LED with the two legs where the longer of the two is the Positive

Thanks

It was in reference to same style of LED (see comments on this video)

 

[Caged]

And that heatsink will probably be fine.

 

[fornowagain]

You sure its positive at the top? And it wont go pop?

Yes its positive at the top, what are you planning on powering this with? They need a constant current 30-34v dc psu. Pop? It'll kill itself in seconds without decent cooling, did I mention how hot they get?

 

[Diagro]

I have a 36V LED Power supply it came with it.

This is removed from a 50w Flood light.

Will that Copper sink not supply enough cooling? :/ If not im going to have to find something!

 

[d_brennen]

Heatsink might be ok, it WILL need airflow though, maybe a significant airflow too

 

[dfarrall]

One way to find out..

 

[Diagro]

Well.

It works. The heatsink doesn't get too warm with an 80mm fan blowing at it.

Thanks for help with polarity

Some pics





The light needs some reflectors and pulling back a bit. At the moment im looseing a lot of light out the sides and when its too close to the lense it actually gives less light.
So I will make a holes in the rear for the heatsink to pop out so the light is further out.

Soo its good so far. Much quieter and slightly brighter.

 

[fornowagain]

You can get lenses and reflectors for those that mount directly on them.

 

[Diagro]

Sweet. Will have a look around. Dont suppose you have any links?