Yes, as written, there are some restrictions about some Transceivers on Aruba 2540 Switch Series...
Pay attention that OM4 quality Multi-Mode (MM) Fiber Optic cables are capable of sustaining 10Gbps under 400 meters...and OM3 MM FO cables work at 10Gbps under 300 meters.
In both cases if the FO cable is a 50/125 um (Core/Cladding diameters in micro meters).
LR works with Single Mode (SM) Fiber Optic cables up to 10 km (Cable has a 9/125 um Core/Cladding).
If your Backbones are going to be made of MM Fiber Optic runs go with OM4 and you will be on the safe side on runs under 400 meters with original supported Aruba Transceivers.