I just got my brand new SkyRay King with 4 Leds. Quality looks really good, price was affordable with 35Euros.
When I got it I followed these simple steps:
Insert batteries
Push power button
switch through modes
remove batteries
dismantle the whole thing into pieces
Make a ātail capā mesurement which resulted in 2.6A
I made the following pictures of the driver, looks like there is some place for a resistor mod.
I think at R3 and R4 I can place another resistor, but Iām not sure which value I need to use. As it currently draws only 2.6A I think thereās a a lot of room to improve this light.
Do you know how I can mod this driver to get a little bit more juice?
Is there an actual aluminum shelf that the MCPCB is sitting on? A lot of the more recent lights are coming without them. Check that before you even start to think about boosting the current.
After that, you can add resistors to increase current across the pads with the .22 ohm resistors, or just jumper across it if you want to go all out (direct thermal path MCPCBs recommended if you do this, especially with good cells).
Yes, the heatmanagement looks really poor, thereās only a contact which can transfer the heat, but Iām thinking about improving that somehow. Can you give me a link where I can buy the resistors? Do I need to place one on each pad?
No, you don't need to place one on each pad. Right now you had 0.11 ohms of effective resistance, and adding more resistors in parallel would lower that effective resistance. Where are you located at? Those resistors are big 2512 package size, but 2010 would also fit.
Best bet is to save your money on the resistors and go all the way and put the LEDs on direct thermal path MCPCBs then just put the LED wires on the input side of the resistor pads (no current flowing through resistors).
It is a bummer that there is no shelf in the light. It seems like more and more of them are coming this way.
Iām located in Germany. I was just curious if itās really a 0.22 Ohm resistor or the labeling says something with 0R22. I just want to ensure to pick the right value.
I just made two more pictures where you can see there head of the lamp with leds, and where it is attached to.
This is the head. The read circle shows the contact area, the contact area is as large as the amount of thermal paste you can see around the edges.
Side view of the head
Battery -> Head view of the host, the red circle shows the area where the head has contact. Itās just 3mm I think.
Iām running the lamp with batteries, which provide more than 10Amps(LiMnCoo2), thatās why Iām curios about the resistors. At least the 10A 230V fuse in my multimeter was fried trying to test the batteries. I saw a spark at the connection and maybe a value of 13 for a short moment
