Bulbs

[East]

I bought some xenon bulbs to upgrade the sidelights & number plate bulbs on my 2010 first. I bought extra as the interior uses the same cap less 501's. Fitted them in the sidelights & numberplate lights & they look pretty cool but they don't work in either of the interior lights. Any idea why or what will work?   
https://www.ebay.co.uk/itm/331819343774

[cancunia]

Those are LED bulbs, I have them in my Berlingo interior lights. They will only work one way round, plus the connecting wire on the bulb can sometimes not make contact with the bulb carrier.

[East]

Tried em both way round but still no good, works ok in side lights & numberplate though