i have several 277 vac lighting fixtures i would like to use. i have available 120/240 and minimal 3 phase 208 high leg. Is there a transformer that would let me use these lights from either the 240 or 208?
I don't know what 208 high leg is but buck and boost transformers should be readily available. Call your local electrical supplier and you can probably get one in a day or two.
In 240 high leg (or stinger leg or bitch leg), three 240V secondary windings are in a delta, with the middle of one of the legs grounded. Then from the corner that's not on the ground side to the neutral point is 208V.