[Cynthia, Prescott, AZ]

Leaf spots at leaf tips could be from bad water. Are you watering them with softened water? Maybe from somethig else, but not sure what. Tiny spots on Oncidiums is sometimes normal. Be sure the leaves are dry when the temp starts to fall.

Shriveled bulb is probably not a problem, as this is what they tend to do after their initial plumpness when first grown. Use the skewer method (search on skewer) to test wetness before watering to make sure you are not over watering and killing the roots.

This is an Oncidium family intergeneric, exact combination of genera we can not say, but grow it as an Oncidium sphacelatum, if you need something to look up, or any of the intergenerics, and average the results you get. This plant can be grown with Phals or a little more light, needs to be watered before completely drying out, but not kept wet.