So last year at service the guy said my headlight bulbs had at some point exploded, which from a quick google search is very common. I have been running Night Breakers. I had the car serviced a couple of days ago and have now just spotted both headlight bulbs are dead again. Coincidence in timing or something being done at service that could cause some sort of spike in power?

I tried ABD HID conversion kit after the previous service but one of them died as well and I just didn't have the energy to faff about so just stuck the old bulbs back in.

Battery was replaced last year. Got a fair bit of ground loop noise on the aux input as well when using 12v power supply to power the audio device. FL2 TD4 GS 60 reg Facelift - so many issues
2019 DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental
Now greatly regret selling the Outlander. MPG of the FL2 is atrocious and so are the fuel bills. Fun though 😎
Couldn’t afford the fuel bills so back to an older Mitsubishi Outlander PHEV. Significantly better than I remembered it to be…

You were unlucky with the hid kit mine has been faultless in the 4 odd years if had them fitted. I'd suggest you just get a replacement bulb for that and put them back in. The standard hb3 bulbs are shockingly bad, and nightbreakers run hotter and fail all the more quickly. Landrover - turning owners into mechanics since 1948

2014 Orkney grey Freelander SD4 GS.
2004 Zambezi silver Discovery 2 Td5 (Gone)
1963 Surf blue Morris Mini Minor Super de Luxe (my little toy)

Ship has sailed on that one. In my annoyance of it failing and the constant reminder that they could cause an MOT to fail (I am that unlucky) I cut them out and binned them. FL2 TD4 GS 60 reg Facelift - so many issues
2019 DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental
Now greatly regret selling the Outlander. MPG of the FL2 is atrocious and so are the fuel bills. Fun though 😎
Couldn’t afford the fuel bills so back to an older Mitsubishi Outlander PHEV. Significantly better than I remembered it to be…

I too found the more expensive , brighter bulbs just blew even quicker than the standard ones.
I did the HID conversion 3 years ago - had no issues whatsoever.

Im afraid I can offer no suggestions that you dont already know about.

Its basically a penny-pinching bad design. Jules

Like BobU my HID conversions have been ok for a good number of years and successive MOT passes. I fitted the 35w variety. At the thick end of £30 for nightbreakers you will soon exceed the cost of a new conversion kit. MY 09 GS manual in Lago Grey, Wood Co arm rest and side bumper strips - now sold.

MY 15 SD4 SE Auto Orkney Grey with colour coded Bumper Door Mouldings

Yeah, really annoying. I’m just gonna get standard bulbs for the time being. It’s summer and it needs to pass its MOT shortly. FL2 TD4 GS 60 reg Facelift - so many issues
2019 DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental
Now greatly regret selling the Outlander. MPG of the FL2 is atrocious and so are the fuel bills. Fun though 😎
Couldn’t afford the fuel bills so back to an older Mitsubishi Outlander PHEV. Significantly better than I remembered it to be…

It's not uncommon for the HB3 bulbs to fail in pairs. The CJB turns them on pretty hard, so life of them is short. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.