What are you planning to keep? The 50/50 9w light gives you 50% usable light so 4.5w. If you had to choose between the two, pick the 7w.
If you had a choice, go with an AHSupply 1x13w or 2x13w retrofit.
If you had a choice, go with an AHSupply 1x13w or 2x13w retrofit.