In MT, white globes are like black globes but allow you to manuver or fire, so no needing flicking. Also in MT, optimized means making smaller (but usually USP code 1).
In this specific case it's only optimized in price and power usage (by a negligible margin, at those TLs where antimatter is available), as it is larger and heavier than a non-optimized USP code 1 White Globe...
Their use is not described in combat rules, though, but is in errata.