Yes, I agree, light seems to me to be the likely culprit.
Yes, direct light is good, as long as it in the early morning or late afternoon. Midday sun will burn them.
Acclimatize your plants to higher light levels by introducing them gradually.
My varied collection of Oncidiums, phals, and paphs get direct sun through an east window from 8AM till 11 AM and they love it. Lots of them in spike at the moment.
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