Rechargeable Light bulbs

[JLK]

I would be very concerned and stay very far away from it, if it works with the earth of the switch...eeeeeish.

I really do not know how it works, we were just guessing it works on the earth line. Because we do not know how the bulb picks up the power is off - the eart line was just a guess. We switched our power off on the mains at the board and the bulb would not go on but as soon as we experienced load shedding it would come on. strange I know and still cant really explain to you how it knows

[Justloadit]

We switched our power off on the mains at the board and the bulb would not go on but as soon as we experienced load shedding it would come on. strange I know and still cant really explain to you how it knows

Yep just as I guessed. There is some electronics inside the globe, which is powered by the rechargeable battery. This electronic circuit measures the line impedance when the power is off. When you switch off at the wall switch, the LN line will show a very high impedance as there is very few loads on the same circuit, however when there is a power failure, the line impedance is very low because it probably measures the transformer impedance, so the electronics then switches the light on.

[HR Solutions]

I know why I am not rich, because i dont rape the gulible public

it works ians ... I've see them .....

[AndyD]

Yep just as I guessed. There is some electronics inside the globe, which is powered by the rechargeable battery. This electronic circuit measures the line impedance when the power is off. When you switch off at the wall switch, the LN line will show a very high impedance as there is very few loads on the same circuit, however when there is a power failure, the line impedance is very low because it probably measures the transformer impedance, so the electronics then switches the light on.

Hmm, call me a cynic but I'm not convinced . I guess it's possible in theory but in practice it would need to be constantly injecting a test signal into the supply and it would need considerable intelligence built into it. There's a couple of other issues as well such as during a power outage it would likely only 'see' the other loads connected to the installation(s) rather than the secondary side of the supply transformer. The impedance of the other lamps, transformers, ballasts, drivers or PSU's on the same switch circuit would also be an issue because this impedance would remain regardless of the circuit being switched on or off. Also if there was more than one of these things on a supply transformer they'd likely interfere with each other unless they all use a unique test signal.

I'm just thinking outloud here and I'll be the first to say that anything's possible so I'd be very interested if someone would purchase one and promptly reverse engineer it to satisfy my curiosity and let me know how it works

[JLK]

Another confusing thing is the fact that it works on a bed lamp which is not plugged into a wall... It comes on and off with the lamps switch. Little mind boggling to the average person.

[Justloadit]

Hmm, call me a cynic but I'm not convinced . I guess it's possible in theory but in practice it would need to be constantly injecting a test signal into the supply and it would need considerable intelligence built into it. There's a couple of other issues as well such as during a power outage it would likely only 'see' the other loads connected to the installation(s) rather than the secondary side of the supply transformer. The impedance of the other lamps, transformers, ballasts, drivers or PSU's on the same switch circuit would also be an issue because this impedance would remain regardless of the circuit being switched on or off. Also if there was more than one of these things on a supply transformer they'd likely interfere with each other unless they all use a unique test signal.

I'm just thinking outloud here and I'll be the first to say that anything's possible so I'd be very interested if someone would purchase one and promptly reverse engineer it to satisfy my curiosity and let me know how it works

Hi Andy,
Actually it is very simple electronics to do this. Current electronics today work with extremely low currents, this is the one reason that capacitance in long wires affects electronics. One could power very small micros with this floating power . Another good example is LED lamps and dimmers, which do not switch off at minimum dimming.

Using a very high impedance potential divider circuit, a number of tasks are handled immediately,
Circuit forms Part of charging the battery, and on no power feeds a tiny current back to the mains line.
Potential divider to measure powered applied from the mains
When there is no power, the battery feeds back into the circuit through the potential potential divider and there will be a difference in voltage between a lamp switched off at the wall, because the circuit is cut by the switch, to the difference off when there is a power failure.

There will be a threshold in which the unit will not be able to tell the difference between a home DB disconnect and a genuine power failure.

At the end of the day, smart thinking and smart product.

Another quick test, is to short the globe L-N connections, and if the battery is fully charged will light up.

[HR Solutions]

I'm just thinking outloud here and I'll be the first to say that anything's possible so I'd be very interested if someone would purchase one and promptly reverse engineer it to satisfy my curiosity and let me know how it works

Andy - you seem in doubt that it works ?? I mentioned previously that I have seen them work. I have "tested" them every which way. They must be used in an everyday light - When there is load shedding, it comes on automatically. If you don't know how it works, then I certainly don't either so I think that some of the guys above are pretty much on the right track. The fact is it works and I have seen it work. I have even found a supplier overseas to import them, but I'm not sure that I want to get into that kind of business.