You can use the Eldoled (EZ1) driver in a 208 three-phase delta, but there MUST be ground. This is to be compliant to NEMA specs and to provide a path for leakage energy.
EldoLED is capable of being connected to a delta supply feed as long as a good ground connection is maintained. However, the application of voltage to the neutral terminal or conductor of the driver is contrary to the installation instructions under the product listing and therefore must be validated by local electrical inspection and/or the Authority Having Jurisdiction. Always connect the product according to local electrical code and by licensed electrical contractors