I got some 4W RGBW leds to RGB everything! I am not sure what heatsinks to get for them. So to keep them within a reasonable temperature to get a long life span, under 60⁰C, how big of a heatsink do I need? And are there any options for active cooling where it's just a few 100 milliwatts for the fan and it allows a much smaller heatsink? I don't want to spend more than $10-15. These are the LEDs:
https://www.amazon.com/300mA-350mA-...d&qid=1560980489&s=electronics&sr=1-1-catcorr
https://www.amazon.com/300mA-350mA-...d&qid=1560980489&s=electronics&sr=1-1-catcorr