Reading the Forum and members experiences in replacing these inverters ,some seem to go through a few a year and even consider these as a normal "consumable" item!
Personally ,and after reselling quite a few,I only had one go faulty ,after 9 months and I just simply replaced it,with another cheapest Ebay item.
These are similar spec---OUPUT 900V-LAMP 300MM-5Ma-8Ma.
I have now found an upgraded alternative Ebay item ,costing 3x more and with higher specs(OUTPUT 1.2KvA-LAMP 450MM-5Ma-12Ma) and a claim that it makes the angel eyes brighter
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Has good feedback and heres the link.
BMW CCFL Angel Eye Inverters E32 E34 E30 E87 E53 E83 E46 E39 E38 E36 Z3 Z4 | eBay
I will be getting some myself
...Just noticed its post with all the 3s ...3,333
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2003 BMW X5 E53 3.0D-Auto, Sportpack,full extras.
Oxford green/
Leder Dakota interior.
51,000 miles @25th October 2015
Heavily OE modded,including full facelift grill install.4.6is body kit,wheels,exhaust tips and ext.fender flares
Non OE mods.Depo "custom" Angel eye headlights.