This floodlight is different from the earlier ones in that it is based on a single flatter housing with both the LED and the ballast mounted in the same space. This particular light came supplied with a 20W green LED and matching ballast which is simply heatshrink sleeved and glued in the light.
The LED module is the common 10x10 array which is used in the 20/30/50 and 100W LEDs with a differing number of LED chips in the array. In this 20W version there are 20 1W chips mounted as two series lines of 10 chips. These strings of chips appear to be wired in parallel giving a probable voltage of about 30V at 700mA.
When I purchased this light I chose the one with green LED chips as I think it would look quite nice as a tree uplighter.
As with all Chinese lights like this it's a good idea to check the integrity of the earthing to the casing. Once again the unit has been supplied with a very short flex just 7" (170mm) long. (Which is actually quite annoying!)
The LED module is the common 10x10 array which is used in the 20/30/50 and 100W LEDs with a differing number of LED chips in the array. In this 20W version there are 20 1W chips mounted as two series lines of 10 chips. These strings of chips appear to be wired in parallel giving a probable voltage of about 30V at 700mA.
When I purchased this light I chose the one with green LED chips as I think it would look quite nice as a tree uplighter.
As with all Chinese lights like this it's a good idea to check the integrity of the earthing to the casing. Once again the unit has been supplied with a very short flex just 7" (170mm) long. (Which is actually quite annoying!)
As usual great information and presentation
The LED looks very different from others you've torn down. I guess green leds don't require a phosphor?
Awesome review! Is there any way we can improve the lumen output or thermal dissipation in this type of led floodlight or is the heat sink from the case enough. Is the led really using the 10 watts that china said it would?. Thanks.
Have you got a link where to buy these in different colours? They would make great garden lights.
InGaN LEDs (including green) are typically grown on a sapphire substrate and thus don't need base isolation as both the anode and cathode need to be wire bonded anyway.