# Why is wiring some LEDs in series better than wiring them all in parallel?

I noticed a lot of guides for making an LED array or matrix prefer to wire their LEDs in series first and then wire strips of leds in series in parallel. What is the benefit of this Vs wiring them all in parallel aside from energy usage, since in series, each LED would be dimmer. Is it to do with current balancing ?

• Could you give an example of such an LED matrix/array? It's unclear what you're referring to, since in a typical matrix, LEDs are neither series nor parallel. Also, LEDs in series are not necessarily dimmer. – uint128_t Jan 30 '16 at 4:33
• @uint128_t Something like lucidscience.com/pro-led%20array%20illuminator-3.aspx How they wire it in series/parallel vs all parallel. Is there a guide line of how to calculate how many you can have in series before you see dimming? – SemicolonExpected Jan 30 '16 at 4:41

Wire wisely or kill your battery. Or wire wisely or waste your power supply. Use Ohms law. (V - Vf) * I