See my Buff Orps, on my page. "The color of a gold watch".Buffs are not supposed to be light. WAY too many are WAY too light. Here are some photos, mostly from feathersite, of correctly coloured buffs of various breeds.
These are red:
If you look at photos on the websites of those who have been breeding buff silkies for a good long while, you will find that most of them have richly coloured birds.