http://www.ebay.com/itm/2pcs-1156-BA15S-7W-Cree-Q5-High-Power-Auto-Signal-Stop-Tail-LED-Light-Bulb-White-/281076582202?pt=Motors_Car_Truck_Parts_Accessories&hash=item417178473a&vxp=mtr
I can read with my cigarette lighter.. LOL.

Also I had the 25w ceramic on hand.. a 5w might work.. if you end up with the "constant dim" lit light..

Can't vouch for these.. but stay in the 7w range..

http://www.ebay.com/itm/2x-1156-Ba15s-CREE-Q5-7W-White-High-Power-LED-Reverse-Light-Bulb-FREE-SHIPPING-/271185372385?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f23e864e1&vxp=mtr