With this LED. I got it for the trunk of my new Avalon, which has a very dim bulb. This is blindingly bright. $2.51 including shipping from Hong Kong.
The adapters fit various kinds of sockets.
http://www.amazon.com/TOOGOO-White-Interior-Light-Festoon/dp/B00KBQCRRM/ref=sr_1_1?ie=UTF8&qid=1410818578&sr=8-1&keywords=TOOGOO(R)+White+1210+SMD+48+LED+Car+Interior+Dome+Light+Panel+w+T10+BA9S+Festoon
http://www.amazon.com/TOOGOO-Vehicle-White-Festoon-Adapter/dp/B00HV3MQ1A/ref=sr_1_2?ie=UTF8&qid=1410818578&sr=8-2&keywords=TOOGOO(R)+White+1210+SMD+48+LED+Car+Interior+Dome+Light+Panel+w+T10+BA9S+Festoon
A bargain at 4 times the price.
Light mounts on metal surface with adhesive. Route wires to existing light socket.