3mm vs 5mm LEDs

I’m about to buy a bulk lot of LEDs and have the choice between 3mm and 5mm for the same price. Any advice on the advantages and disadvantages of each, with respect to building them into a case?

5mm are larger and tend to be brighter. They may be easier to mount depending on what you’re doing with them. 3mm could fit into smaller locations or be tighter point spots if you want.

What’s your goal with the LEDs?

I used a 3mm RGB LED in my old sixaxis controller to light up the PS button, they are alot smaller than the 5mm. If your trying to get the LED into a small space Go 3mm.

3mm is the only size you’re going to fit if you want a light-up bubbletop. And probably will be easier to drill and install into buttons.