The yellow top coating on the LED's is not only to protect them, it's for converting most of the blue light to "white-ish" - The actual LED's are Royal Blue, and the coating is loaded with Phosphor :)
***** UV-ish meaning high energy, right? Looked up wikipedia...aparently blue LEDs are also made from zinc selenide which apears to be cheaper than gallium arsenide so that would explain the use of blue LEDs. I'm guessing if aluminium nitride become popular uv based white LEDs are also going to become the most common form of white LEDs.
The creepage between primary and secondary is quite small - look at the bottom of the board (at 5:15) and the top of the board (at 6:40), and you'll see that the creepage is only about 1mm between the transistor on the primary side and the diode on the secondary side.
That can be turned on with 12V supply too, but may not be as bright as with mains. I have seen mains halogen bulb with same GX5.3 base in sale in Estonia.
I have found a very nasty B22 led bulb which has the voltage dropper circuit and led's all on one board, which to make matters worse is directly touchable if the plastic cap is removed (which is easy). Ledlam 3w golfball led B22. Found this issue by accident and not by tearing the thing down!
There are applications out there for these mains bipin base lamps. A neighbor of ours got a fairly expensive designer fixture that took mains bipin base MR16 lamps, yet it shipped with a 12V lamp because 'it fits in the lampholder durrrrrrr.' Needless to say, the lamp exploded in use. Had to order 120V bipin lamps from somewhere online. The 13001 is an MJE13001, which is a common power device in these nasty blocking oscillator supplies. And I would not trust the isolation of this as the transformers these use usually only have a few layers of sticky tape between the mains and load windings.
randacnam7321 That's really the worst possible arrangement, 12V lamps and fixtures for higher voltage. All the lamp fixtures with that type of base here in England are either 12V or rarely 24V, certainly nothing higher.
"but of course take away the lens..." and someone's just dropped an egg yolk in there. Does anyone else think of eggs when they see these sort of lamps? On a more serious note, I'm really surprised to see a transformer in this thing.
The yellow top coating on the LED's is not only to protect them, it's for converting most of the blue light to "white-ish" - The actual LED's are Royal Blue, and the coating is loaded with Phosphor :)
***** Yes, that seems obvious now you have mentioned it. Presumably the exact phosphors are selected to obtain warm white, cool white etc.
+zaprodk Aren't most of them using UV LEDs?
+ronettreker UV LED's are hard to manufacture. Royal blue is UV-ish and makes a lot of materials fluoresce.
***** UV-ish meaning high energy, right? Looked up wikipedia...aparently blue LEDs are also made from zinc selenide which apears to be cheaper than gallium arsenide so that would explain the use of blue LEDs. I'm guessing if aluminium nitride become popular uv based white LEDs are also going to become the most common form of white LEDs.
The creepage between primary and secondary is quite small - look at the bottom of the board (at 5:15) and the top of the board (at 6:40), and you'll see that the creepage is only about 1mm between the transistor on the primary side and the diode on the secondary side.
Not an issue though, as isolation is not required in this application.
That can be turned on with 12V supply too, but may not be as bright as with mains. I have seen mains halogen bulb with same GX5.3 base in sale in Estonia.
Hi John Do you remember from wich seller you get them?
No, this video was made over 3 years ago.
I have found a very nasty B22 led bulb which has the voltage dropper circuit and led's all on one board, which to make matters worse is directly touchable if the plastic cap is removed (which is easy). Ledlam 3w golfball led B22. Found this issue by accident and not by tearing the thing down!
There are applications out there for these mains bipin base lamps. A neighbor of ours got a fairly expensive designer fixture that took mains bipin base MR16 lamps, yet it shipped with a 12V lamp because 'it fits in the lampholder durrrrrrr.' Needless to say, the lamp exploded in use. Had to order 120V bipin lamps from somewhere online.
The 13001 is an MJE13001, which is a common power device in these nasty blocking oscillator supplies. And I would not trust the isolation of this as the transformers these use usually only have a few layers of sticky tape between the mains and load windings.
randacnam7321 That's really the worst possible arrangement, 12V lamps and fixtures for higher voltage. All the lamp fixtures with that type of base here in England are either 12V or rarely 24V, certainly nothing higher.
*****
Creepage???? Wuzzat?????
/Idiot PCB designer
"but of course take away the lens..." and someone's just dropped an egg yolk in there. Does anyone else think of eggs when they see these sort of lamps? On a more serious note, I'm really surprised to see a transformer in this thing.
¡Genial!
Diode gone wild....