Engineer Grade reflective signs offer the basic level of reflectivity in completely dark conditions. Signs with 3M Engineer Grade reflective sheeting last for at least 7 years outdoors. 3M "High Intensity" Grade reflective signs offer up to three times more light reflection and brilliance than engineer grade reflective signs. Diamond grade reflective address signs offer ten times the reflectivity of Engineer grade signs and come with an outdoor life of at least 12 years. These signs combine high daytime conspicuity with superior nighttime reflectivity. They also have wide-angle reflective performance due to which the text can be read from any angle, even in the dark. Diamond grade signs are the best choice for places with a lot of visual distractions like the busy streets. High Intensity or Diamond Grade signs are popular because they can be spotted from a greater distance and a wider angle. Watch this video to virtually experience all three variants of reflectivity.