Does anyone know what colour a ripe Philippine lemon is?

Well, too late now, it's already in the oven ...

I'm making a lemon cake. I used 4 local Philippine lemons - not
calamansi, which are much smaller in size. I think these are called
dayap and the rind is dark green. I used this
recipe I found online. I reduced the sugar slightly, and apparently also the butter (I read 1/2 lb as 1/2 cup)! I also created my own buttermilk using water and a couple of tablespoons of plain yogurt mixed together, and a splash of lowfat milk. ...

Delicious. The tops are brown and crunchy, and the inside is a nice dense, yet still light (because of the reduced butter) texture. I remember really creaming the butter and sugar together for several minutes - perhaps this is the effect... The recipe makes 2 loaves. I have just 1 loaf pan, so I spooned the rest of the batter into these little oblong cups.
The
recipe calls for a lemon-sugar syrup to be drizzled over the cake, and then a lemon glaze made of confectioner's sugar & lemon juice. I can't imagine it needs both; I like that the cake tastes nice and lemony and not overly sweet.