Thanks Tom for the details regarding the bulbs used on your Subaru. I guess that on your car, the 1157 have BAY15D sockets and the 1156 are BA15S sockets, is that right?
You're right, the 7W LED's will give already good result as I showed before. Although, I wanted something better, much better, including a bright new concept of a double current driver. The new SHP LED's are using a double CREE 5W LEDs as well as 12 Epistar High Power LED's on the side. That's an equivalent of 16W but I wouldn't call them simply 16W bulbs because the integrated double current driver provides a much stable current to the LEDs and as a result, they will be much brighter. The lens is made of high temperature glass. As reverse lights, I pretty much sure that they will work well because the white version of the CREE projector provides 600lumens!
For other LED needs like the interior, I'm using the excellent Nichia Raijin Superflux LED's. At 50mA, they have an efficiency of 160lm/W!! Incomparable with the SMD 5050. Although, they are not easy to source and they don't exist with specific car bulb sockets. I've been using these LED's with great success as parking lights in my F430 and dimmed foot well lights. They require a current driver and a decent heat sink.
Thanks again for your support