You will be okay with your current setup. Hoya lacunosa is very easy to bloom. 6-12" above the plant is ideal, but I've had bulbs just a few inches above my lacunosas before, so really as long as you give them adequate clearance so they don't reach up into the bulb with their new vines, you'll be fine. They are a lot more light-intensity-tolerant than they look. I moved mine over to my western balcony doors and they love it there.

As for variety of lacunosa⦠now you are speaking to a topic close to my heart! If you get them from a BBS or a nursery you are going to get one of the following: (plain) lacunosa, lacunosa 'Snow Caps', lacunosa 'Ruby Sue', lacunosa 'Royal Flush.' Of those, 'Snow Caps' is my favorite, but it's really a matter of preference - they are all attractive.

Are those my favorite lacunosas, though? Nuuuuuuuu not even close. I really like the clones with teeeeeeeeny tiny leaves. They look so delicate in a window, like an ornate paper cutting. SRQ Hoyas has a good variety and two of my favorites are:

Hoya lacunosa 'Langkawi Island' Cutting (SRQ 3077)
Hoya lacunosa 'Thai Clone' Cutting (SRQ 3047)

Hoya lacunosa 'Tove' Cutting (SRQ 3026) is very attractive if you like large leaves and flowers (for lacunosa).

Now, this is a more impractical suggestion, but since you brought it up, Epiphytica has some wicked cool lacunosas.

{{gwi:979651}} (longest leaves)
{{gwi:979652}} (smallest leaves)

And then floating around from the Liddle collection there is also the very pretty

Hoya lacunosa Poonsak (IML 1648)

Very excellent post,thanks for the info! Now I have some decisions to make...

On the hours of light issue, mine are outside permanently and we never get 16 hours of daylight any time of year. The longest day is 13.5 hours and my lacunosa bloomed well and for a long period of the year. In my experience you'd get away with 12 hours easily.