The abacus Orion 2 is a post-top lantern designed to run on a 400w SON or 450w MH lamp. They are normally mounted on a 5-8m column. 

Chertsey library car park 

These abacus Orion 2 lanterns run on a HQI-E metal halide lamp. They are in the Chertsey library car park. 
this lantern is Dayburning, but the other lanterns aren’t.

Here is under a non-Dayburning one.