Oncidium with sun damage, black spots, ailing outer leaves

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Many Oncidiums always have lots of spots. Onc. Sharry Baby is known for this. A drought-damaged plant like this may continue to develop spots until the plant becomes happy. The spots aren't related to light, they're related to insufficient watering and humidity.

Be sure you check for spider mites. They attack plants during periods of warm temperatures and low humidity. They prefer plants with soft, thin leaves, like Oncs.