I have a 50W ceiling light in my room, and it seems like too much for my small room.
The driver takes in 220V AC and outputs 160V at 0.3A DC. (Lots of LEDs in series.)
The left side of the driver is the mains input and the right is the DC output to the LEDs.
I’ve come across low resistance resistors R5 and R6, which I’m presuming is a sense resistor.
Close up photo below:
Weird thing is, there’s a pot R8 in series with R5 and R6 which reads 3.3K Ohm and couldn’t figure out why it would be in series with the sense resistors.
I’ve tried tweaking the pot down to 2.4K Ohms and the light gets slightly brighter (10) and up to 4.2K Ohms and the light gets slightly darker. (10).
So I’m wondering if there was more that I could do to reduce the brightness to around 50% of the original amount.
So I replaced two 0.3 Ohm sense resistors with four 0.25 Ohm ones in series since I only had those. They were a pain to solder, but the did manage to reduce the brightness from 850 lux to 550, so we have some progress here.
I’m going to see if I can find higher value resistors to cut the brightness down even further.
My kitchen has 14 Sylvania 10W/95CRI/PAR20 bulbs that put put 550 lumens each plus 6 Philips 10W/85CRI/MR16 bulbs that put out 490 lumens each, and 6 Nichia 219’s in under-counter lights ( Hera halogen counter light Nichia 219 retrofit ) Is that bright enough for you?
I don’t like the ones we have unfortunately. They’re too bright, and the color temperature is too cool, around 6500K. I also think it’s a local product (although made in China) so I don’t think you’ll be able to find the lights anywhere else.
I do appreciate that it is constant current and exhibits no PWM. 120Hz PWM would drive me crazy.
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CRI: 80
I decided, well, I agreed, that’s deciding, right? that we’re looking for flat panel ceiling lights — have to be LEDs, city code.
Seems like LEDs are improving so fast that it’d be stupid to do the architect-standard thing and put recessed cans into the ceiling.
Grainger has some that might suffice.
Also looking for premade under-cabinet lights — yeah on Nichia.
I’m ok building flashlights but don’t feel like I can make a building inspector happy with homemade within reach of splashes and careless hands near the plumbing.
