LED Brake Lights / Signal Lights / Reverse Lights Combo

I have been surfing about a bit, and I have a few more questions on this matter :

- is bigger LEDs ( like 5mm and 3mm, of course 5mm is bigger, eh? ) better for my intended application?
- for lens colour choices, should I go for diffused or clear?
- what does luminous intensity actually means? Does it means that higher numbers ( in a webbie that I surfed, it stated there luminous intensity = mcd ) means brighter LEDs?
- if I use LEDs that offer higher viewing angles, is it a good idea for my application?
- human eye receives brightness better right? So LEDs that offer the most brightness should be pretty good for my application, eh?
 
Normal LEDs usually takes round 3v rite? Just get 4 in serial and there's no need for any cap for 12v applications?
 

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