wight:
comfychair:
A COB LED is just multiple small LED dies in a single package. Example: the square ‘10W’ LEDs have nine 1W dies, arranged 3 strings in parallel, each string with 3 in series. The big square 100W has 100 1W dies, 10 series/10 parallel. Some vendors may be calling it a ‘COB’ when it’s not, multiple individual LEDs on a circuit board is not really COB.
To make the dimming work, you’ll need a DC converter with adjustable output voltage, and then a potentiometer of some sort to control it. The dimming is done by giving the bulb less than 12V. A converter with fixed 12V output will work with a dimmable bulb, it’ll just run at full output all the time.
Eh, I are these MR16’s not like other ‘dimmable LED bulbs’ which do not dim with voltage? The “110v” bulbs (60w bulbs and similar) are intended to run on a wide range of voltages without dimming. Instead they look at the waveform to see if it’s been “chopped” (like shown here ) and adjust the output accordingly. Those bulbs are also unable to achieve a full 0% - 100% dimming range.
I have no experience with the MR16 replacement bulbs - maybe they are a whole different ballgame.
You may be right, I haven’t used any MR16 stuff either. If this were my project, I would gut the cheapest MR16 bulb I could find and just use it as a housing.
This one uses a fixed 85-265VAC 600mA “3-4x 3W” driver.
