The 0-4 High Contrast (HC) lens has a VLT of 83% down to 5%. This lens has a red base color to help enhance details. The 1-3 High Contrast (HC) has a VLT of 75% down to 17%. This lens has a rose base color, which is also designed to enhance details.
Because of the red base, the 0-4 HC will naturally be slightly darker than the rose base of the 1-3 HC when exposed to the same conditions. If you have light sensitivity on bright days, are out mostly at night or fair-weather days, are out West/at altitude, or prefer a darker all-condition lens, the 0-4 HC is your best choice.
f you struggle the most on low-light days, live in areas with weaker sun/more flat light days (midwest, PNW, NE), or do not have light sensitivity on bright days, the 1-3 HC is your best choice.