Lighting I run a couple of Invisible Sun LED boards and have a few Q's..

[Justin Credible]

Hey,

Nice to see Invisible Sun LED on here too! I think they are a trusthworthy company and their boards are good as well.
I got myself a couple of their boards back in september 2018 and have done a couple of runs with them sofar.
Delivery of the boards to my country (Netherlands) was quick and my questions were answered in a reasonable time so customer support seemed OK as well.
So far so good and I am pretty happy with them sofar.

However, there are a few things I can't seem to wrap my head around.
I have the ISH250pro (Samsung LM561C) and I have the ISH265 (Samsung LM301b).
Both these boards were supplied to me with the exact same driver, the HLG 240H-48A.
I have done some measurements and first of all what struck me is this;
The ISH250pro draws 220w total from the wall when both potmeters are turned maximum to the right.
The ISH265 draws 320w total from the wall when both potmeters are turned maximum to the right.
The ISH265 flickers when both potmeters are turned up so I had to turn that one down a little bit..
I have a feeling this is NOT right.

As far as I know the Samsung LM301b is a bit more efficient so why oh why does my 301b board takes up so much more power from the wall? This is something I just don't understand.
I have been reading up but still I don't see it. In my logic these drivers should supply a maximum of 240w but both boards are nowhere near these numbers.. The 561 only takes 220w and the 301b takes a whopping 320w.
Did I receive faulty drivers? Does it have anything to do with the fact that my boards came pre-wired in parallel?
What is going on here? Why does the more-efficient board (301b) take up way more power and flickers? Why does the 561c board only take 220w?
I mailed Invisible Sun to ask them this but unfortunately did not get a reply this time so I figured it was time to ask on here.

Is there anybody that can elaborate on this matter?

 

[Mr Green Fingers]

Cant answer you on the v1 board but the v2 301b, I spoke to Rich at invisible sun about the flickering and you are right, it's because they are wired in parralel (this is correct for the driver we have), he said if I wanted to max out the power I would need a constant voltage driver and to wire them up in series, think that's right but I'm lame at DIY and electrics so I might have got that a bit mixed up but you get the jist :smoking:

 

[Justin Credible]

Cant answer you on the v1 board but the v2 301b, I spoke to Rich at invisible sun about the flickering and you are right, it's because they are wired in parralel (this is correct for the driver we have), he said if I wanted to max out the power I would need a constant voltage driver and to wire them up in series, think that's right but I'm lame at DIY and electrics so I might have got that a bit mixed up but you get the jist :smoking:

Thanks for thinking with me bro, appreciate it!
It's just that I don't see how the v2 301b board is more efficient if it draws way more power at the wall. I mean, they speak of an efficiency increase of 7% compared to the v1 561c board.. But it draws 320watt at the wall for me versus the 561c board which is drawing 220watts..

I' m also not that good at electronics but it isn' t exactly rocketscience either. I am just wondering if maybe I should get other drivers and rewire the shit in series.
Maybe someone from Invisible Sun can chime in?

 

[Mr Green Fingers]

I think when talking about efficiency it means the amount of useable light the diodes generate and how little light is wasted don't think it has anything to do with how much power its pulling from the wall although less power the more efficient the diodes are but there producing less light, again I don't know to much so might be talking crap

 

[Invisible Sun LED]

Hi sorry for delay in answering problems with Tapatalk

The simple answer is the lm301b has less forward voltage so when you run the driver with the voltage maxed out to plus 10% you will increase the draw. I suggest turning the voltage down to 48v not 53v as it will be if set to max

Hope that helps

Sent from my Nokia 2.1 using Tapatalk

 

[Invisible Sun LED]

The flickering is a symptom of over voltage

Sent from my Nokia 2.1 using Tapatalk