| Welcome Fitzdiva!
Buds commonly turn yellow and fall off when being moved from the location from which they first developed (grower's greenhouse environment) regardless of what you do - good or bad. Put your phal in a location where it does not get any direct sunlight on the foliage unless it is a few feet from the window - then early morning may work OK (east). I have personal experience with putting phals next to NE window and have "cooked" it. If the leaves are getting warm - too much light. Good bright indirect light is usually the best. It not likely that the lighting had anything at all to do with your bud drop. I have found warm stuffy environments to be very hard on phal blooms - good air circulation is always good as long as they are not cold winter drafts. A gravel tray will help - I use them - adds up to 10% humidity to the immediate vicinity. Overwatering is the #1 problem with phals - watering frequency is different for location, media, time of year, etc. Generally water just before it drys out - for me that is weekly to every third week depending upon time of year. Some people mount them - and then they must water every day. The skewer method noted on this site is a good place to start learning when to water if you are learning. The weight of the pot and plant together will tell you a lot. When they are significantly lighter it is time to water - you will note this when comparing with the bamboo skewer (method). Eventually the skewer can be removed and not used, but it is a good initial teaching tool. Many people use a weak fertilizer solution and then use it every time. Water until plenty of water flows out the bottom and flush under running water every couple of months to reduce any mineral deposits that may be accumulating over time. Hope this helps! Enjoy. Mike  |