I saw this lamp while browsing for other stuff and bought it to take a look at. It was intriguing that it had the appearance of a 4W lamp but was rated at 1W and mentioned SMD LEDs. I wanted to see how the SMD LEDs had been coupled to the lenses.
It turns out it's not a 1W lamp and doesn't use SMD LEDs, but it's still quite pleasing and VERY hackable.
Despite it's seemingly super-low power rating it does a surprising job of creating a pool of light on the floor of a room that is ample for use in navigating your way round a dark house. And the fact the LEDs are being run at a third of their rated current suggests that they will last a very long time and are easily replaced anyway.
The very small number of LEDs means this lamp will also work on 110V, but be even dimmer.
This is quite a hard lamp to find on eBay, so here's a search link that may find them if they are available:-
http://www.ebay.com/sch/i.html?_odkw=1w+4+led+smd+lamp+220v+e27&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=1w+4+led+smd+lamp+220v+e27&_sacat=0
If you enjoy this channel you can help support it with a dollar for coffee, cookies and weird Chinese lights at https://www.patreon.com/bigclive
It turns out it's not a 1W lamp and doesn't use SMD LEDs, but it's still quite pleasing and VERY hackable.
Despite it's seemingly super-low power rating it does a surprising job of creating a pool of light on the floor of a room that is ample for use in navigating your way round a dark house. And the fact the LEDs are being run at a third of their rated current suggests that they will last a very long time and are easily replaced anyway.
The very small number of LEDs means this lamp will also work on 110V, but be even dimmer.
This is quite a hard lamp to find on eBay, so here's a search link that may find them if they are available:-
http://www.ebay.com/sch/i.html?_odkw=1w+4+led+smd+lamp+220v+e27&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=1w+4+led+smd+lamp+220v+e27&_sacat=0
If you enjoy this channel you can help support it with a dollar for coffee, cookies and weird Chinese lights at https://www.patreon.com/bigclive
Whaaaaat? An LED lamp that's likely to last a long time? Just how long a time? – And, do you still have it? Is it still working as it should?
Where China LED, Big Clive leads!
You're forgetting that a lot of current will be going through that stupidly low value resistor instead of the capacitor. The impedance of that capacitor on 50 Hz is about 32k and the resistor is 100k, so about a quarter of the current – roughly 2 mA – wil be going through the resistor. That adds another ~0.4 W. So your meter was spot on showing 0.5 W.
Just a late addition, they use V*I to get the power, and not a dinky little meter like that. 7mA on 244V = 1.71W.
What does the 100n/400v capacitor do? I see this a lot, but do not understand it at the moment.
I'd swap out the LEDs for RBGs
How may watts would that 100k resistor be pulling?
Still brighter than a darkroom safelight…
How is it possible to get 12V (or 16V if the leds are 4V EA) from a wall socket (220-240V) without a stepdown converter or a transformer?
Clive! thank you very much for the hours of entertainment I have got out of your videos. they are awesome and unfortunately I have now binge watched them all 🙁
wait a second… how did he measure 7mA without breaking into the circuit?
I use 4 of those 1w bulb in anteroom 24/7 and I can say that its give nice warm light, and I really don need to use main light at all, and electric bill didnt even saw the difference after all that time of using it.
Such light is really good for night decorations of home entrance or patio/garden.
I picked up one that looks quite like that one, except it is run from USB, same light setup and makes a nice light for use when soldering while sitting in my recliner.
Someone could use it as soft light for restaurants.