Please note that the dots and discoloration is normal for this plant. They are heavy feeders and requires good fertilizing. They also seem to like acidic soil better.
Recreate conditions under a tree canopy, where plants receive lots of light, but it is filtered through the foliage of the trees above. Your light should be bright enough to cast soft shadows.
Low Humidity: Ideally Above 40%
This Hoya tolerates a drier environment. However, it could still benefit from light humidity care, including misting and grouping together with other houseplants. May require humidifier in cooler, drier months.
Intermediate: Lowest 60F
This hoya does not require high heat, but does not tolerate cold as well as other varieties.
Does Sunstress
This plant has evolved to shift color when exposed to bright sunlight, much like a human getting a tan. This does not harm the plant with proper care.