Hoya sp. EPC-209 NRT 1 Blooms Open During The Daylight Hours

I had never noticed it before, but Hoya sp. EPC-209 NRT 1 is one of those few Hoyas whose buds open in the daylight hours. I went into the tent in the morning, and the buds had not opened; went back in a couple hours later and they had sprung open. Here is a photo before the blooms have had a chance to reflex: