Bentley Institute Learning Unit Equivalency

Is there a defined equivalency by Bentley that explicitly states the conversion of (LU) Learning Units to the more widely used and accepted (PDH) Professional Development Hours or (CEU) Continuing Education Units? I've search the website and have been unable to find anything to clarify or state the specifics of a (LU) Learning Unit even a statement defining that 1 LU is equivalent to one hour of instruction. Is there any available information or concrete definition provided by Bentley. I feel like it would be appropriate for an institute providing certifications with specific units measurement to have said units defined.