Read from the World of Warcraft client build files.
How Light's Vanguard Helm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Light's Vanguard Helm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Light's Vanguard Helm is part of the transmog set Light's Vanguard Battleplate (Paladin only), which the Appearances collection lists in 4 versions. The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Light's Vanguard Helm Fits
Other Items Named Light's Vanguard Helm
1 other item in the current build is also called Light's Vanguard Helm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 247185 (247180 to 247190) were usually added in the same batch as Light's Vanguard Helm: the same quest line, zone, vendor or reward set.