I have only been growing as a collector this past year, and only a few of mine have gotten to blooming stage. However, I am in Eastern Washington, long gloomy winters, lots of overcast days in spring, with hot dry summers.

Hoya bella- took 3 years from cuttings, very sheltered East window. Started budding and blasting at about 1.5 yrs, finally bloomed when I started fertilizing with Miracle Grow Bloom busters. Now I have 20 peduncles getting ready to pop.

Hoya javanica- purchased as a plant, have seen this guy bloom from cuttings in well under a year.

Hoya shepherdii- I have a 7 month old cutting producing buds right now. Recieved as cuttings in November, rooted them under a fluroescent grow light, where they lived the first couple months before being relocated to a North window (with adjacent West window).

My grow light isn't fancy, the fluorescent I use only to give cuttings a boost if needed, and get babies through the winter. I do have two LED lights, the $10 bulbs available at Amazon, that screw into a floor lamp. The only Hoya I grow that I think really needs it in the winter is my H. imperialis....

Also, I have pubicalyx RHP, Pink Silver, and Bright One, the first 2 are about 7 months old, no peduncles yet, and my Bright One is a year old plant, no peduncles yet.

If adequate lighting and care conditions are met, regardless of whether or not it is natural or artificial, then the hoya will bloom when it is mature enough. At least, in my experience. But my setup is not usual:

I, too, am in WA (Silverdale). I grow mine indoors in the cold months under retrofitted T-8 LED lights. The ballasts hold 4 light bars each, and I have 4 ballasts (so 16 light bars, total). They also get sun exposure from a South facing window (with sheer curtains, to avoid crisping the plants) and a West facing patio door.

When nighttime temps no longer fall below 55, I harden them off and they go outside. As soon as the weather starts getting cooler, I prepare them for indoors.

I have had many hoyas push out peduncles and bloom from barely rooted cuttings. There are still some I have had for 1+ years that just sit, looking pretty. I think it all boils down to time, if you are providing correct care!