I was looking to replace my 12V 7w bulbs with LED ones and the fitting is T15 wedge and these are what I have now 
https://www.amazon.co.uk/Wedge-Bulb-T15-12-volt/dp/B00AVWFCQ4 they are crap not very bright at all I then realised I can get LED T15 bulbs but they are for cars and my transformer is AC.Can anyone recomend a T15 LED bulb