I have led bulbs on the MotaLeira and all are bright except the tail/stop bulbs.
When I bought them they were supposed to be Ultra Bright.
Any recommendations of where to buy some decent ones?

buy? pah, I made my own bulbs.

but before you chain that wallet, can you check you have good poewer supply to the bulbs first - could be dodgy wire or connector.

test them by putting them across battery first to see if they are brighter.

The wiring is fine, just over exaggerated brightness claims of ebay sellers

I got some from Halfords, standard stop/tail fit. They were alright until the leds started blowing one by one...