I found a LED "sealed beam" 2-terminal floodlight bulb, about 4" diameter, that apparently is 6W at 12V. It's fairly bright, but that's not what was interesting. Looking into the diffuser lens, it didn't have a typical yellowish fluorescent material in it that's typically used for LEDs to make white lamps.
Odd I thought, but when I powered it up it became apparent what was going on - this lamp is a RGB LED lamp using distinct LEDs! What was weirder...
At 6V, it lit up red with their lowest Vf.
Then at ~8V it lit up yellow when the green LEDs turned on.
Then finally at 10V or so, it's fully white when the blue LEDs turned on with their highest Vf.
Then going past 12V, it started taking less current as the internal SMPS probably converted voltage to current and reduce current consumption.
This is the weirdest bulb I've ever seen ... it's a voltmeter in itself much like someone can guess voltage depending on brightness/yellowness of an incandescent bulb. In this case you can tell by looking at the color output.
I wonder if a lot of these low voltage specialty bulbs are like this now?
BTW, though it looks like a "sealed beam" I highly doubt it's really sealed and will leak water...
Odd I thought, but when I powered it up it became apparent what was going on - this lamp is a RGB LED lamp using distinct LEDs! What was weirder...
At 6V, it lit up red with their lowest Vf.
Then at ~8V it lit up yellow when the green LEDs turned on.
Then finally at 10V or so, it's fully white when the blue LEDs turned on with their highest Vf.
Then going past 12V, it started taking less current as the internal SMPS probably converted voltage to current and reduce current consumption.
This is the weirdest bulb I've ever seen ... it's a voltmeter in itself much like someone can guess voltage depending on brightness/yellowness of an incandescent bulb. In this case you can tell by looking at the color output.
I wonder if a lot of these low voltage specialty bulbs are like this now?
BTW, though it looks like a "sealed beam" I highly doubt it's really sealed and will leak water...
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