Hi Lycheeluva,
You've been bitten by the same bug as me. Currently, I have four lychee trees growing well. The cultivars are: Sweetheart, Brewster, Emperor, and Hak ip. They are relatively small trees so far. I don't have any high tech setups...they are, literally, sitting in front of some south facing windows, and a sliding glass door (all inside, of course). Thus far, the light levels seem to be fine...they also get light from inside the house during the evening. The Emperor is, as I write this, loaded with blooms...mostly M1 varieties, but some Females are popping through now. I'm currently in the process of trying to hand pollinate the females as they emerge. The other three trees are not quite mature enough for blooms yet...another two or three years for them. I kept the Emperor outside the longest this year, in hopes that the temperatures would incite flower production. Apparently, it worked. Lychees need about 100-200 chilling hours of temps around 40 degrees (they are sub-tropical, afterall). The house temp is around 68-70 degrees...perfect for flower production. If the temp is too hot, the flowers will drop. I'll post some pics of the flowers soon. Eventually, I will be building a greenhouse of epic proportions to house the large growers (sweetheart, brewster, hak ip), but that is some time off into the future. I'll go fiddle with the camera now, and see if I can get some good shots for you.

good to hear from you north tree man- and great to hear that you have gotten the emperor to bloom.
my tangerine had about 150 blossoms on it but all but about 10 fell off- the tree looked like it got to hot and/or dry. why? because my mother in-law who was babysitting decided it would be a good idea to close the door of the room housing my plants- cutting off air circulation and allowing the lightinng to turn the room into a boiler room.

can't wait to see your pics.

below is a link to some of my pics including pics of my lychee tree. (im planning on buying a sweetheart and a brewster in the spring- as well as a couple of mango, jaboticaba, mangosteen, etc etc)

northman- its great to make contact with you- now im not the only tropical fruit lunatic in the north east.

now if you will excuse me, im off to buy a really expensive life insurance policy for my mother in law.

Here is a link that might be useful: pics