OR 2W

OR 2W

What is also equal to.. So green is as visible as a blue or what? Thanks can seem to find a answer anywhere just that green is.
MULTILANE, 1W OR 2W WITH. URBAN LANE CLOSURE,. STANDARD 09. ENGINEER OF SAFETY ENGINEERING.
1) What is the difference of a 1W and 2W unit in practice? 2) Can I skimp and get an older 40 channel set? Will they become illegal in the future. OR 2W