interior lights

Hi all I am desperately looking for brighter upgraded bulbs for the interior lights in the fn2, I recently was able to improve the main interior light at the front with 501 W5W bulbs from halfords, which are a million times brighter than the OEM. My question is does anyone know of or have any...

Has anyone else had this? Some days the interior lights will not turn on, this includes the vanity lights on the sun visors and the reading lights. This seems random, but sometimes going over a bump or a fast corner will bring them back to life. This obviously suggests something is loose, but...