Mejui Light issue. A8

Been using a couple A8's from mejui for 4 or 6 months and now 4 of the bars on one light are very very dim. The other 4 are bright and normal.
Is it possible that the dimmer could do that ? Ive heard @bk78 talking about tossing their junk dimmers.

I dont see the dimmer doing this so im going to have to assume that its the wiring inside. (the 4 bad ones are lighting up very dim and they get a tiny bit brighter with the dimmer)
Driver says 24-50 volts or something close to that , so im assuming they wired them in series to get 48v. Not sure.
If they were completely out , i would just suspect a broke connection but with them still lighting up , im a bit worried. Does mejui even have customer service ?

When i first reviewed these A8's , i said they were cheaply built with a TERRIBLE design in the way you put them together. Im still happy with the purchase as long as i can open the frame up and fix the problem. (overall , they are fine if you be careful putting it together....the light is amazing)

Thanks all

That sucks. I'm really not too surprised though. It's a Chinese light.

getogrow said:

Been using a couple A8's from mejui for 4 or 6 months and now 4 of the bars on one light are very very dim. The other 4 are bright and normal.
Is it possible that the dimmer could do that ? Ive heard @bk78 talking about tossing their junk dimmers.

I dont see the dimmer doing this so im going to have to assume that its the wiring inside. (the 4 bad ones are lighting up very dim and they get a tiny bit brighter with the dimmer)
Driver says 24-50 volts or something close to that , so im assuming they wired them in series to get 48v. Not sure.
If they were completely out , i would just suspect a broke connection but with them still lighting up , im a bit worried. Does mejui even have customer service ?

When i first reviewed these A8's , i said they were cheaply built with a TERRIBLE design in the way you put them together. Im still happy with the purchase as long as i can open the frame up and fix the problem. (overall , they are fine if you be careful putting it together....the light is amazing)

Thanks all

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I would take the dimmers out of the equation and inspect all wire connections and hook it back up just to ensure I know precisely where my issue lay.

dbz said:

I would take the dimmers out of the equation and inspect all wire connections and hook it back up just to ensure I know precisely where my issue lay.

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I have no problems doing any of that but what i do not know anything about is dimmers. i learned enough to not care about how the dimmer works so my question is: How do i eliminate it ? If i just take it off, will it just give me 100% power ? Thanks bud!

getogrow said:

I have no problems doing any of that but what i do not know anything about is dimmers. i learned enough to not care about how the dimmer works so my question is: How do i eliminate it ? If i just take it off, will it just give me 100% power ? Thanks bud!

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There's only one dimmer right? It sounds kinda like a wiring issue to me.

PadawanWarrior said:

There's only one dimmer right? It sounds kinda like a wiring issue to me.

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Likely, however to troubleshoot I would remove all potential variables.
The dimmer, then use a multimeter to test each point of contact with the wiring. Could be as simple as a splice or solder.

dbz said:

Likely, however to troubleshoot I would remove all potential variables.
The dimmer, then use a multimeter to test each point of contact with the wiring. Could be as simple as a splice or solder.

Click to expand...

Ya, I wonder if it's right at the hinged part. Since that folds I think.

PadawanWarrior said:

Ya, I wonder if it's right at the hinged part. Since that folds I think.

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Nah , it dont fold. According to other reviews , i think bk is the one i actually listened to, the folding ones are much better quality and about the same price. The way it goes together is a shitty idea. If it had something to hold all the bars into place then it would not be near as bad but you cant really take these down without help. (its 10 pieces vs one) All 8 bars are just laying in the socket....nothing holding them in but gravity.

Im gonna go take it apart now. Its one dimmer per light but im only working with one light right now. Surely the problem is right in my face.....
If its not and i cant see the problem then can i just cut the dimmer off the driver ?

Is this the one? If so, it's not the dimmer. The HLG-600 has two output cords to handle the 16.7 amp output. I'd start with voltage checks on the dead side. Start at the driver and follow it from there.

LOL, At least they use American music.

First check should be the dimers. Happens occassionaly...

Here is the problem. Does this do anything at all besides connect wires together ? im wire nutting um all together and calling it good.

1212ham said:

Is this the one? If so, it's not the dimmer

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Yea thats the one but they didnt send me a MW , i got an inventronics brand driver on both lights. They have no idea how to use the meanwells with the daisy chain mode ,so they say.

getogrow said:

View attachment 4819455View attachment 4819456
Here is the problem. Does this do anything at all besides connect wires together ? im wire nutting um all together and calling it good.

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If you fix that it might just do it again. There's gotta be a reason that part burnt out. There could be a short further down the line or something.

It was probably a bad soldering joint.

getogrow said:

View attachment 4819455View attachment 4819456
Here is the problem. Does this do anything at all besides connect wires together ? im wire nutting um all together and calling it good.

Click to expand...

That will work, but you'll be shunned for not using Wagos.
Are there two of those? You might do both if there are. BTW, Inventronics are good drivers.

1212ham said:

It was probably a bad soldering joint.

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Yes it was. bad joint on that part where its burnt on the board.

PadawanWarrior said:

If you fix that it might just do it again. There's gotta be a reason that part burnt out. There could be a short further down the line or something.

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The reason that part burnt out is for one: it shuoldnt be there at all. Two , its a cheap junk connector that was already broke but it was still getting enough connection to make um come on.

I just did the right thing and used wirenuts. Less resistance and easier to use if your not going for looks.

getogrow said:

Yes it was. bad joint on that part where its burnt on the board.


The reason that part burnt out is for one: it shuoldnt be there at all. Two , its a cheap junk connector that was already broke but it was still getting enough connection to make um come on.

I just did the right thing and used wirenuts. Less resistance and easier to use if your not going for looks.

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At least you got it working.

works fine now.....gonna have to replace the other board and 2 more on the other light....eventually

1212ham said:

That will work, but you'll be shunned for not using Wagos.
Are there two of those? You might do both if there are. BTW, Inventronics are good drivers.

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Lol, shunned for not using wagos.

dbz said:

Lol, shunned for not using wagos.

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Those are too hard to get a hold of. Gotta go all the way to the store for those. I got wirenuts handy at all times. wagos are for rich folk and american designed lights

If i upgrade most every piece in the light , it will be a quality built light. hahahahahah

I DID make sure i put calmag in the wirenuts. Im not stupid.


about a pound.