Still need help with highpower LED flasher (555 timer 1w LED)

[The_Sinpy]

I made this circuit and it works fine. But I want to add on to it and use more LEDs. I'm still having fun time understanding mosfets and current
Anyway can I throw on another set of 3 LEDs in parallel to the other set I already have or will this be to much of a load for the mosfet to handle? If so could I use two mosfets to power each strand of LEDs?

Power: Automotive 12.5~14.5
LEDs 1watt LEDs off eBay 3.4~3.6 350mA
Mosfet: N-Channel IRF510

 

[Harald Kapp]

Both your circuits should work.
The IRF510 is good for 4 A (5.6 A with good cooling). As each series resistor (27 Ω) limits the current per LED string to ~160 mA, you can easily add up to ~25 LED strings to one single MOSFET.