'Radial Lite', simply because it fans two lower arcs of rinse above the bristles which is easiest to practise avoiding above window frames. There is only one outer radial blade instead of two with the other radial brushes (radial and rocker) and two inner bristle blades for scrubbing and keeping the brush flush on the glass.
The outer radial row of bristles are shorter than the other two style of brushes but are still good for regular work. It's the lightest brush of the three.
The sweet spot for rinsing is when the water is about 20mm above the bristles with the right gooseneck angle.
On wooden windows with silicon sealant and UPVC windows with rubber sealant, tilting the brush about 15-30 degrees keep the blade of water sheeting to the edge without breaking the surface tension so no missed spots left behind after water cascades down the glass behind the brush.
Get the flow of water right and the technique right and this brush is wicked for perfect rinsing on glass. Yes you do use more water for cleaning the glass with these brushes but you save a lot of time so finish earlier during the day or simply clean more windows during the day. Wouldn't use the brush if it was rubbish but been using radial brushes for near on a year and they are my chosen favourite for ease of cleaning windows.
You got to change the way you clean windows with these brushes as using them how you would with a normal stock brush wouldn't reap the benefits of using these brushes for the purpose and technique they were designed for. You need a really good flow of water otherwise you won't be able to clean with it properly.
https://www.youtube.com/watch?v=tmXQBx747_A&feature=emb_logo