Some VERY interesting LED modules

That dimmer specification is marginal. The 43V is the problem. It would work but you would probably not get full output. The LED is specificed as 44V typical, 46.5V max so the driver may not reach the rated 700mA curent.
This one:

file:///C:/Users/rober/Downloads/EUP30D-1HMC-0_102100251101_EN%20SPE%20DALI%2030WATT.pdf

has a 650mA 45V seting which would be better. and is 97.5% of the rating. You won't notice the missing 2.5%.

Robert G8RPI.

I think you may have linked to a local file on your C Drive?

Doh!

But the recommended type is clear: EUP30D with Dali.

I understood that with a 0-10V dimming you can do this just with something like a 100kOm potmeter connected to the driver and that with a 1-10V dimming you need an active adjustable voltage supply connected? Is this really the case?

Double

Edited By Jouke van der Veen on 13/01/2023 16:00:01

Perhaps the difference between 0-10V and 1-10V dimming I mentioned above is wrong.

Perhaps a CC Led driver with a “sink” dimming system only needs a potmeter for dimming while a driver with “source” dimming needs a dimmer which feeds a DC voltage (0/1-10V) to the driver?

Hallo Robert G8RPI,

The dip-switch values for the EUP30A and EUP30D are the same, so to see.

650mA/9-45V and 700mA/9-43V for both.

And I found in a datasheet that the EUP30A is dimmable by means of a passive resistor (simple potmeter?).

Somewhere else it was said that you should not apply a led driver above approx. 80% of its maximum power, higher would have a negative influence on its lifetime.

The driver module that I ordered is one of these: **LINK**

https://uk.rs-online.com/web/p/led-drivers/7772724/

If you look at the ‘series’ data-sheet, there are several variants available, compatible with different types of dimmer.

Can’t comment on value-for-money because mine was a very reasonably priced ebay purchase

”bought for a project and never used”

I will try it with a suitable dimmer when I can, and will report back.

MichaelG.

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Edit: __ see also

https://www.meanwell.co.uk/led-drivers/constant-current-led-drivers

Edited By Michael Gilligan on 13/01/2023 20:23:12

Apologies …

I should have mentioned that the ‘Guide’ linked on that RS page is a useful download.

MichaelG.

That is good; thanks Michael.

Well I guess that depends on the quality of the unit. Any decent unit should have a decent lifespan at full load. I cetaninly would not routinely derate equiment by 20%. A quality unit will already have adequate margins. Generally for any electronic component de-rating it will improve it's reliability / lifespan but there are exceptions. And it's not just liftime and load. Efficency tends to be lower with less than full load and ambient temperature also lowers life. If yo uknow the ambient is likely to be high that is a reason to consider a higher rated unit.
Unfortunatly a lot of lower cost (compared to top brand similar item) equipent tend to base their ratings on the "absolute maximum" ratings of their main internal components. without refence to other considerations.
A classic mistake, nnot just with cheap makes, is the gold anodised metal clad power resistors e.g a 25W 25 ohm WH25. It's 25 W so you can put 1 A through it right (P = I squared times R)? Yes, but only if it is on a 23cm square 1mm thick aluminium plate at a 25 degree C ambient. Even at that the resistor will be at over 140 degrees C.

Robert G8RPI.

Here is a link to a mains powered LED driver. I have never used this supplier but I am tempted to order one.

lMAAOSw4qFiY5tO&amdata=enc%3AAQAHAAAA4J4rVp%2FK3ZcF2lBT2Bc%2F7lwrMr%2Bjz7VIv4uLLsUqSrBAcweCy%2B1RYDjPHal%2BiuzvC2VGkCpvkeRoJAJYB2N%2FfeycYyFAsDXsKClTCvZ7E5ZrBykuxkwuEiDuRUeEMf7%2BpynvxPsv7kzuer2QQA6i80tH2CcjnSy640jylMjLIVnbiQaJRewmURsSuk2crbzI1K0ilnFgB%2B7GBayucwYGyJISjrDmvAfoh0p5awmfsOq5%2BGSOyd%2B4wgf9somBBGrfo%2FTi7QHzn3LESLVFRyWdyk%2FKwftwreUkf28EW7TkX05v%7Ctkp%3ABk9SR5bM1YS2YQ">https://www.ebay.co.uk/itm/195351986113?hash=item2d7be2bfc1:glMAAOSw4qFiY5tO&amdata=enc%3AAQAHAAAA4J4rVp%2FK3ZcF2lBT2Bc%2F7lwrMr%2Bjz7VIv4uLLsUqSrBAcweCy%2B1RYDjPHal%2BiuzvC2VGkCpvkeRoJAJYB2N%2FfeycYyFAsDXsKClTCvZ7E5ZrBykuxkwuEiDuRUeEMf7%2BpynvxPsv7kzuer2QQA6i80tH2CcjnSy640jylMjLIVnbiQaJRewmURsSuk2crbzI1K0ilnFgB%2B7GBayucwYGyJISjrDmvAfoh0p5awmfsOq5%2BGSOyd%2B4wgf9somBBGrfo%2FTi7QHzn3LESLVFRyWdyk%2FKwftwreUkf28EW7TkX05v%7Ctkp%3ABk9SR5bM1YS2YQ

I could not get the link inserted in the normal way. So the ebay item number is 195351986113

Les.

Edited By Les Jones 1 on 14/01/2023 12:46:24

Edited By Les Jones 1 on 14/01/2023 12:50:28

Edited By Les Jones 1 on 14/01/2023 12:55:10

Edited By Les Jones 1 on 14/01/2023 12:59:11

'Blocked site' on my server Les

Regards Ian.

Works now, original "Led driver" didn't.

Edited By Circlip on 14/01/2023 12:52:09

For your future convenience, Les

All you need from that massive hyperlink is what I have outlined here, in green

.

.

Everything else there is ‘tracking’ which describes your journey [to those who are tracking your activity.

MichaelG.

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Edit: __ Thanks for the link … That’s a very good price

Edited By Michael Gilligan on 14/01/2023 13:28:18

Perhaps a good price but what about quality? Further, no dimming function.

And perhaps low price is compensated by costs for postage, at least to The Netherlands.

You WILL want dimming with these LED Modules!

.

Not for my originally-intended use.

But yes, it will be generally useful to have dimming available.

MichaelG.

I have a couple of these LED modules and what has surprised me is the amount of heat that is radiated forward by the LED array. Initially I noticed the radiation when I used my hand as a shield from the light. While not in any way or form a definitive measurement within 5 - 10 seconds a piece of black dense foam material held about 1cm in front the LED module began to melt and smoke but the back panel on the module had barely begun to warm. I wonder what the ratio of radiated heat and conducted heat is and how much will this affect the size of any heat sink required. Having seen what happened to the foam it would be advisable to check that there nothing close to a working module that could be melted or catch fire.

Martin

That’s very interesting, Martin … and a useful warning !

I would hypothesise that the heat is actually being produced at the back of each LED [because that’s what they do] and some of it is radiated forward by the backplate cum circuit-board … more noticeable than usual because of the very slim construction.

It looks like some serious heat-sinking will be required.

MichaelG.

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Edit: __ I will probably use these on my first pair, and see how they do:

https://uk.rs-online.com/web/p/heatsinks/0271870

[ mainly because I already  have them ]

… much cheaper ‘reasonable approximations’ could be knocked-up from pieces of aluminium channel.

Edited By Michael Gilligan on 14/01/2023 19:35:31

That’s quite a big heat sink! And Robert’s calculation showed that a 1.77K/W would be needed, so even bigger.

I am thinking of replacing a dimmable “up-lamp” now fitted with something like a 150W 118mm r7s halogen bulb.

This lamp creates a lot of heat but no heatsink is needed.

When mounting a led module as discussed here a big heatsink will be needed. I doubt I can find space for this.