Help, Leptotes bicolor is blasting all its spikes!

[camille1585]

I need some help with my Leptotes bicolor. I got it about a year ago as a NBS plant. In October I was really pleased to see that the 4 newest and largest growths were starting spike nubbins. But they seem to grow a little bit, then they just dry up and die. 3 have blasted so far, and I'd really really like to save the last one which is stll green. I'm growing it mounted on cork, with no sphag. It gets heavily misted twice a day and dunked every 2-4 days. Right now it's hanging a few inches under my 55W powercompact light. Temperature is about 20°C, and the humidity is in the 55-75% range.