Those generic plant label's are challenging aren't they ... and so confusing at times! I don't really think of Hoya's as tropical foliage plants but some Hoya's do grow in tropical climates, and although not all Hoya's will survive in direct sunlight, some do take more sun than others ... most all of them like bright light.
It drives me crazy when I go to one of the big box stores and find labels stuck in plants that aren't even for that particular plant. A year or so ago I was at one of our local Home Depot garden centers and found a lot of the Exotic Angel plants mislabeled. There were lots of Hedera helix (Ivy) label's stuck in Codiaeum (Croton) and Hoya plants. When I checked out I mentioned it to the cashier and she said it just so happened that the lady from the Engelmann nursery was there so she called her over. She asked me if I'd mind showing her what I was referring to so we walked back to the section where the EA plants were located and she began checking plants and pulling labels right and left! She was flabbergasted, saying that it looked like every single plant had an incorrect label and I don't remember her exact response but it was something along the lines of it being unfortunate that the folks who had that particular job at the nursery were not English speaking and had no idea what plant was what! That to me is inexcusable and makes me realize it's all about the $$$ to most of the big box stores. So many folks buy plants because they like the looks of the foliage or flowers, and the plants die because they go by the care listed on the label not even realizing that the care instructions are for an entirely different plant!! Ok ... I'm done ranting.
Hetty: Do you know which Hoya you bought that has the variegated foliage? Can you post a photo? I haven't been plant shopping at HD, or anywhere else lately because I'm trying to be good and save my money right now ... which is hard because this is the time of the year when they are getting in lots of new stuff for spring!