On H11 Headlights
When I found my Heep uses H11 low beams I though that was great, a 55w bulb instead of the usual 37.5 and did seem quite bright. Until I put in SilverStar Ultras.
When changing I was surprised to find the originals were Osram (Sylvania) but marked differently from the SSUs. Stock was an H11 (64211L+) and the SSUs were H11C (62411SU). Both 55w.
But not the same. In exchange for a shorter life (note: the H6054Ss I put in a Reatta in 2001 are still much brighter than stock) you get a somewhat brighter/whiter light.
According to several sources the L+ (LongLife) is rated at 1350 lumens and the SSUs, 1750. compared together (SSU in driver's side and L+ in passenger), the SSU is noticably whiter and the L+ has a slightly yellow tinge.
Apparently there is yet another level in an H11, the Night Breaker at 1790 lumens but to get much better (and not quite legal in the US) you need to trim a 65w H9 to fit the socket.
Notary Sojac Y'all
One of these is a diesel: