A test to see whether three LED lamps with radar / microwave movement sensors will interfere with each other.
To make this test work I had to cut off the LDRs (Light Dependent Resistors) that are used to give the dusk sensing function. It's notable that in normal use the LDR will also cause the lamp to turn off and retrigger repeatedly as it can see its own light when lit and that defeats the dusk sensing function when it's dark. So removing the light sensor (LDR) will allow continuous retriggering without going out if desired. (But the lamp will trigger at any time of day.)
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
To make this test work I had to cut off the LDRs (Light Dependent Resistors) that are used to give the dusk sensing function. It's notable that in normal use the LDR will also cause the lamp to turn off and retrigger repeatedly as it can see its own light when lit and that defeats the dusk sensing function when it's dark. So removing the light sensor (LDR) will allow continuous retriggering without going out if desired. (But the lamp will trigger at any time of day.)
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
I can't believe it's been 6 years since I commented on this video!
I was about to order 3 to put side by side. Then I realized they probably won't turn on because they'll think it's daylight, as soon as one turns on.
Googled for a bit and landed back here 😅
For what I had in mind, I don't really want to to remove the LDR, plus they're a different bulb that's much harder to open.
So basically is like a motion sensor.
if only the delay can be adjusted
The sensor circuit looks at the homodyne (zero IF) output made by mixing the transmitted signal with its reflections. If the microwave oscillator runs at 5GHz then for something moving at 1m/s (like a person) towards or away from the sensor, this generates a signal at 2 x 1m/s x 5GHz / c = 33Hz (similar to the Doppler effect). So the frequencies of interest are up to a few hundred Hz at most. Anything higher can be ignored (filtered out). For a nearby sensor to generate a difference frequency of only 500Hz (perhaps within our detection band), it would have to run at 5GHz ±500Hz e.g. 5000000500Hz i.e. only 0.00001% different in frequency. The oscillator frequency is determined mainly by the mechanical layout of the circuit and by associated components (with tolerances over 1%) so the chance of the frequencies being so close is negligible. So we don't expect one sensor to interfere with another, even if we have a few dozen working close together.
I must be living under a rock up here in Alaska I didnt know some LED lights had built in speed traps
Depends if you get the one with real dusk to dawn that detect sunlight instead of any light.
In the US, the screw shell of an Edison socket should be at neutral also, But many older portable lamps have non-polarized plugs, FUN!
every moth in the garden sets these off… gone back to pir lol
perfect to use as garden light
Would these bulbs work on 12v DC from a car battery?
It's a sign of the times that big Clive is happy that the real power is more than half of the stated power. I wonder how long it would be for China to live down it's reputation for fibbing about specifications.
Neat lights. I purchased a small portable light sort of like that, however this one runs off 4 AA cells. I use it in the bathroom of our Motor Home when we are camping and no 110 volt shore power is available. Wife said she needed a night light and this really does the job, it is not all that sensitive though, some times while you are doing your job the light goes out and you need to wave a hand to start her going again. Doesn't seem to eat batteries we have used it two winters now and she still works just fine with no battery changes.
I've put three from a different type in one lamp and I got a light show. They trigger each other.
"mega farad"
Now you have to make a video of those lights getting cooked in your microwave now, followed by a post nuke functionality test where I expect some sparks, crackles and pops to occur.