Today I replaced the Angel Eyes headlights on my Roadster with the original Wipac units. Dipped beam cut off is significantly sharper.
I also added LED sidelights into the headlamp units. The wingtop lights have been LED for a while.

At the rear, I've replaced the brake lights and cobra with LEDs and the difference in light output is significant. Reflected against the garage door, I would say triple the output of the standard bulbs. These LEDs are white. I prefer red light covers.

From a safety point of view, this is a cheap and simple upgrade.

'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4