I have this one blooming now and just looked at it. It is more on the white side than yellow. This is a new orchid for me and is blooming on the second spike which was just buds when purchased a month or so ago. I'd guess that your growing conditions are better than mine as my plant is on display in an east window with less than optimal lighting here in Western PA. I always thought that good light and culture would initially intensify flower color. Let's see if the lip color fades as the flowers age. You may have just grown it so well that you brought out the best color the plant has to offer.
Paul
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