'As many directions as possible was an exaggeration', but 'a couple of degrees'? By that definition, every bicycle here has a diffuser. I can perfectly see refl

'As many directions as possible was an exaggeration', but 'a couple of degrees'? By that definition, every bicycle here has a diffuser. I can perfectly see reflectors of bicycles a few meters to the right, yet my lights shines there under an angle of at least 10 degrees.