Bhwide is a wide angle bhabha simulation, originally written for LEP. We use it with input beams from guinea-pig, as it takes into account the most important QCD cross-sections in its calculation of ISR. Guinea-pig has the built in capability to do an ISR calculation, but bhwide was chosen, being a more extensive solution.
We embed bhwide in a home made program ("bhwrun" developed mostly by S. Boogert) so that it accepts inputs from different beam simulations: at runtime, there is the choice of using guinea-pig, circe beams or beams with no energy loss simulation. There are the added options to a.) include/exclude beamspread b.) boost all components of the particles' momenta, as opposed to just the z-component c.)
Bhwide has an intrinsic angle cut: it will only output events where the deflection angle is more than ~110 mrads.
In our runs, we typically generated 500,000 to 1 Million events to generate a luminosity spectrum from.