9V battery to power up a 6 pcs & 12 pcs of 20mA 4-pin 130Ãï¿½ÃÂ° Power LED (White)
After I read some references, (I hope I'm not mistaken...) it is all about the resistors?
So what would I like to know is, between a 270 ohm and 120 ohm resistors which one more suitable for the 6 pcs modules and the 12 pcs if I wanted each modules gives suitable brightness(on a scale 1 for dim and 5 for very bright, 3(maybe will work) - 4(if I'm not asking to much :D), and how do I arrange it ? I've been reading the Instructables Q&A around 9V battery and LED lately.
I'm afraid I haven't catch the solution, and I hope my question will helping anyone whose have the same specific problem, and be useful for everyone else generally.
Thanks in advance everyone.