With the new Safariland Rapid Light System (RLS), you get a professional quality hand-held light and gun-mounted light all in one.
You can clip it onto your belt, hold it in your hand, or quickly mount it to your gun for an instant tactical advantage. There's no need to buy an expensive holster to carry a light-mounted gun. No reason to carry a second primary light. You will always have a bright light whenever and wherever you need it. It's the only light you need... Period.