led which way

Hi all, I've 4 wall lights with these bulbs: 5 Watt G9 LED Bulb - 36x SMD5050 Warm White Dimmable G9/5050SMD/WWD Wired to a dimmer switch They were working fine, I took them off to paint the walls, and can't remember which way round to reconnect them (and who know where I put the piece of...