A couple of my Hoya's are turning pale green. Not as dark as they use to be.
NOT yellow, NOT dying. Growing well, just pale.
They get early morning direct sun from 8am to about 9:30 then I pull an outside shade down. Plenty of light but no direct sun.
Soil is 3 parts pearlite, 3 parts orchid bark, one part potting soil.
Potted in plastic orchid pots with holes all around. I water when top 2" are dry.