Angraecum Leonis.....Questions.

[Cattleya17]

Hello everyone im new and my name is samuel and i got an ang leonis about 3 maybe 4 weeks ago in bloom. the first bud blasted and it immediatly sentout another one. This bud was small and upside-down and it then turned right side up and started to lengthen its tail and get fatter so just over night when things are going good it turned yellowish and then by the end of the day it is now completly yellow. this happened to the other bud too! while things are going good with absolutly no probs they just blast for no apparent reason overnight what could be wrong? too much light? its 6 inches from my flourescent lights its a T-5 bulb that emits 5000 lumens humidity rarely falls below 55% i am watering like the woman from cal orchid said to(she said water when you can stick your finger down to the second knuckle and barely feel moisture) but it seem that when i water the buds blast but it happens a little before that point im confused. the temps go to about 73 at day and down to 65 or sometimes 62 at night. im in my house growing. am i not supposed to water period untill flowering is over or should i only mist