Looking for advice regarding the mode of failure for a xenon headlight bulb before I splash out £100 on a new bulb {L405}

Noticed that the NS bulb glowed a slightly blue then orange colour for a few moments, then went out. Switched headlights off then back on and it comes on again then does the same. This can be repeated.

Do xenons act this way before dying completely, or are they like halogens that just die?

TIA

Paul GONE 2010 Facelifted 3.6 TDV8 - Stornoway Grey + 22" Overfinch Olympus
HAVE 1999 Discovery 2 GS 4.0 V8 - Silver - Off Road Toy
GONE 2013 L405 4.4 SDV8 Vogue. Black with Silver roofline and 22" s
HAVE 2015 Jaguar XF.

Have you swapped the bulbs over ? just to rule out the igniter/ballast thingy . 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

Not yet Axel, but it doesn't look like a 5 minute job, so thought I'd ask first before trying that. GONE 2010 Facelifted 3.6 TDV8 - Stornoway Grey + 22" Overfinch Olympus
HAVE 1999 Discovery 2 GS 4.0 V8 - Silver - Off Road Toy
GONE 2013 L405 4.4 SDV8 Vogue. Black with Silver roofline and 22" s
HAVE 2015 Jaguar XF.

In my experience with my L322 it is more likely to be the ignite than the bulb based on the behaviour you describe.