Quote:
Originally Posted by Orchidtinkerer
what makes it tough sometimes to determine the flowering time is that a lot of these will be imported from the other side of the world like thailand and the season will be opposite to ours. They get sold in bloom having come from a different climate and either the plants stick to the yearly pattern they grew up with or they try to adapt to the different climate they are now exposed to.
This can mess up when they flower and has confused.
I avoid dry rest periods for my orchids and I have noticed this gives different results. A dry rest can delay flowering in some orchids so one grower might have his flower 2 months earlier than another grower.
Artificial lights can mess things up even more as I myself am tricking a couple inot thinking it is spring when it isn't yet 
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The first new blooming after purchase might occur outside the expected period as the plant is still adapting after import and/or induced blooming, but after that there is no reason for the plant to not spike/bloom based on cues in its current environment in the years following that. From what I understand, the OP has had the plant for a while, so I wouldn't expect previous growth conditions to play a role anymore.
As to artificial light, it will only mess up blooming if photoperiod is important to the plant. For the majority of orchids light won't be blooming trigger since they naturally occur close to the equator, though I understand that, for instance, there are certain groups of Cattleyas that do need changes in photoperiod in order to trigger blooming.