This looks so neat. It's basically a large area LED lamp that comes in convenient kit form to create a circular light source up to 12" (300mm) in diameter. The slight downside is that it's live at mains voltage when lit.
The driver IC is slightly perplexing. It's a three pin buck driver that uses a choke/inductor to control the current through the LEDs, but having only three pins it still somehow manages to get a reference across a sense resistor to the negative rail. Possibly with clever circuitry that gets that reference while the internal MOSFET is off and there is no current flowing through the resistor.
I'm guessing these lamps are intended for use inside circular metal light fittings where you install it in place of something like a 2D or circular style fluorescent lamp. The case has four small magnets on the back, and also two screw holes. In a fitting where they are screened from touch they will be fine, but in the open where humans or animals could be attracted to the device they pose a shock risk if contact is made with the LED solder connections.
On the basis that they are really nice and just begging to be played with or used as a wall ornament, this is a bit of a shame.
These came from Banggood, but note that they are intended for around 220V operation. That said, the circuitry looks like it may accommodate 110/120V supplies, although the 20 and 24W units may be pushing it a bit as it will rely on the peak voltage on the main electrolytic to run the LEDs.
Update. I tried the light in a 120V shaver socket and the 24W unit flickers, but stops when just one of its panels is changed to a three LED one. So the 20W unit may work on 120v, but the 12 and 16W units will probably be fine.
If you are fully aware of the voltage and safety limitations, then the link for these is:-
http://www.banggood.com/LED-12162024W-Panel-Board-Ceiling-Lamp-Chip-Light-With-Transformer-And-Magnet-p-1007191.html
If you enjoy this channel you can help support it with a dollar for coffee, cookies and slightly risky LED lamps at https://www.patreon.com/bigclive
The driver IC is slightly perplexing. It's a three pin buck driver that uses a choke/inductor to control the current through the LEDs, but having only three pins it still somehow manages to get a reference across a sense resistor to the negative rail. Possibly with clever circuitry that gets that reference while the internal MOSFET is off and there is no current flowing through the resistor.
I'm guessing these lamps are intended for use inside circular metal light fittings where you install it in place of something like a 2D or circular style fluorescent lamp. The case has four small magnets on the back, and also two screw holes. In a fitting where they are screened from touch they will be fine, but in the open where humans or animals could be attracted to the device they pose a shock risk if contact is made with the LED solder connections.
On the basis that they are really nice and just begging to be played with or used as a wall ornament, this is a bit of a shame.
These came from Banggood, but note that they are intended for around 220V operation. That said, the circuitry looks like it may accommodate 110/120V supplies, although the 20 and 24W units may be pushing it a bit as it will rely on the peak voltage on the main electrolytic to run the LEDs.
Update. I tried the light in a 120V shaver socket and the 24W unit flickers, but stops when just one of its panels is changed to a three LED one. So the 20W unit may work on 120v, but the 12 and 16W units will probably be fine.
If you are fully aware of the voltage and safety limitations, then the link for these is:-
http://www.banggood.com/LED-12162024W-Panel-Board-Ceiling-Lamp-Chip-Light-With-Transformer-And-Magnet-p-1007191.html
If you enjoy this channel you can help support it with a dollar for coffee, cookies and slightly risky LED lamps at https://www.patreon.com/bigclive
I have some of those 🫥
6 years later this product has been discontinued at the time I'm writing this.
I wonder what the longevity of that aluminum backed PCB actually is? Modern bean counter manufacturing would prolly frown upon this cost. In the long run could this unit be rebuilt and modernized using the panels and original housing and either made safer or spicier 🤔
If the LEDs were coloured and wifi enabled they'd be great!
That looks like a nice light fixture to you? Remind me to never have Clive decorate my house …
Why not have a safer version that accepted 5v as input? No earth or fuse there as expected and I guess the circuit boards are live – ouch!
Who!!! Did 39 dislikes………. explain yourselves!! And then enjoy some sex and travel to use a very old term, you b’stards!
Now you see Clive an idiot and non electrician like me who has a few of these LED strips around would assume it’s safe to touch (just like mine are) and yet it’s F’l^*King NOT!!!
How do we idiots protect ourselves and our children?
Also what is that red thing you place wires into rather than fitting a plus type thing?
Clive, do you know that when you go off and do your drawing, photos etc to us you are always gone for a split second? Bet you have no idea why I mentioned this? LOL
KINDEST
Bob
Can the panels be bent?
I would love to see a DC version of this for camping!
BANG Good!
@bigclivedotcom
I know this is a few years old, I did notice the lights are available in 4 sizes on Banggood still.
Do you know if the circuit would be dimmable using an electronic trailing edge dimmer?
I tried to find this on eBay using the description from Banggood (Panel board ceiling lamp) and found some intriguing round versions. Maybe time to revisit to see if it's the same circuit.
Now there is a mantra to live by from Clive……. Never ram it in… work your way round then push it all the way home………………..
My girlfriend sends her thanks !