LEDgardener

Hi All,

Firstly, just want to thank all the contributes here. While this is my first post, I've been following and learning alot on this forum during lockdown, but here goes for my first post.

I've build my first set of strip lights and all seems to be going well. I have a set of 8 EB Slim G3's running off of a 700ma constant current driver (Meanwell HLG-240H-C700A). All strips seem to be outputting a similar brightness, except for the first strip in the circuit, that is MUCH brighter. So much so that I've noticed that several of the diodes have begun to die. I've been searching the forum and cant find a discussion of this error. Have I missed something in my first attempt, or is there something off with this strip?

TIA.
(You can see how much brighter the top left strip is)

Thats a bit odd. Can you do a drawing of your wiring if possible

Are all the strips the same batch?

This is straightforward series circuit. I presume they are from the same batch. They were all ordered from Digikey at the same time. Not sure if the detail printed on the strip indicates the batch number, by here they are from the bright strip and a regular strip.

Regular: Bright: I have also built another set, and have another driver, so plan on testing those this weekend to see if I get a similar or different result. I might even test the other driver with this set of lights to see if that gives a different result. But from your response, it doesn't seem as if I have overlooked something obvious, which is encouraging.

Vanster wrote: ↑

Sat Sep 05, 2020 3:36 pm

This is straightforward series circuit.

Your diagram appears to be Parallel Circuit Wiring with the PCB Traces as the "Power Supply" to all strips. For "Series" LED Driver with a "Current Limit" only the 1st Strip would receive the selected Current (mA)...



This is a Series Circuit...




Good Luck.


Series and Parallel Circuits for comparison...

How did I miss that! It makes a lot of sense now that you point it out. Thanks for the assistance. Guess i'll be spending the afternoon rewiring it . I'll let you know how it goes.

Thanks again

@Vanster ,
You're welcome...

BTW, Bridgelux states in the Datasheet that the LED Strip insulation has a recommended 60 Vdc rating.
In your application; BXEB-L1190U and HLG-240H-C700A (178 ~ 357Vdc) ... 42 - 45 Vf * 8 = 336 - 360 Vdc

Bridgelux Gen3 Slim Datasheet... https://www.bridgelux.com/sites/default ... ev%20A.PDF
Page # 4;
... The working voltage designated for the insulation is 60V d.c.

Thanks Peter. What do you mean by the strip insulation being 60? I was aware of the 8 strips being at the upper end of the driver range, but not sure what you mean by the strip insulation.

Also, I'm running at 700ma, so I read the max voltage as 41 * 8 = 328, within the driver range of 357.

PeteR_1 wrote: ↑

Sat Sep 05, 2020 7:20 pm

@Vanster ,
You're welcome...

BTW, Bridgelux states in the Datasheet that the LED Strip insulation has a recommended 60 Vdc rating.
In your application; BXEB-L1190U and HLG-240H-C700A (178 ~ 357Vdc) ... 42 - 45 Vf * 8 = 336 - 360 Vdc

Vanster wrote: ↑

Sat Sep 05, 2020 8:22 pm

Thanks Peter. What do you mean by the strip insulation being 60? I was aware of the 8 strips being at the upper end of the driver range, but not sure what you mean by the strip insulation.

Also, I'm running at 700ma, so I read the max voltage as 41 * 8 = 328, within the driver range of 357.

PeteR_1 wrote: ↑

Sat Sep 05, 2020 7:20 pm

@Vanster ,
You're welcome...

BTW, Bridgelux states in the Datasheet that the LED Strip insulation has a recommended 60 Vdc rating.
In your application; BXEB-L1190U and HLG-240H-C700A (178 ~ 357Vdc) ... 42 - 45 Vf * 8 = 336 - 360 Vdc

Bridgelux Gen3 Slim Datasheet... https://www.bridgelux.com/sites/default ... ev%20A.PDF
Page # 4;
... The working voltage designated for the insulation is 60V d.c.

Just like Electrical Wiring which have both Temperature and Voltage Ratings (usually printed on the wire) the Bridgelux Strips have "Electrical Ratings" from the Manufacturer in the Datasheets... The sizing of the LED Driver is not in question, just pointing to the actual Voltage of over 300V, (328 Vdc)... since the LED Strips are not "Rated", at higher volts Electrical Archs increase, can possibly occur more frequently.

what size tent is this in ??