The light on my 996.1 has been fairly poor so after reading a post on here, I decided to buy some Yeaky D2S Xenons (£22) for the low beam, some Ring Xenon effect 150% H7 (£26) high beams and some Xenon effect side lights (£9). The side lights are now white instead of yellow and the others really do seem much brighter. All the bulbs I removed were Philips, but I believe the Xenons do a have useful life even though they still work.
Here's a video.
https://youtu.be/E5Vg5y8U5j0
Here's a video.
https://youtu.be/E5Vg5y8U5j0