Light Radius is the illuminated circle around players that allows them to better see their surroundings.
Some items can change the Light Radius of the player by equipping them. Charms do not require the player to equip them in order to increase the Light Radius.
Improving light radius through the magical properties in items means that a character can more accurately see enemies and therefore can avoid surprises and fire from afar when required more easily.
Diablo I[]
In the original Diablo, Light Radius also had a tactical aspect, where it would affect when monsters took notice of the player and would begin advancing toward them to attack them. In this way, characters with a large light radius could trigger monsters from far off and save some walking, whereas those with a small light radius could sneak past groups of them.
Diablo II[]
In Diablo II, the base Light Radius is 13 and the max is 18. So there is no point in a character's equipment netting more than +5 to Light Radius unless they also have items with a negative light radius.
| Name | Type | Radius |
|---|---|---|
| Aldur's Stony Gaze | Hunter's Guise | +5 |
| Angelic Wings | Amulet | +3 |
| Atma's Scarab | Amulet | +3 |
| Axe of Fechmar | Large Axe | +2 |
| Azurewrath | Sword | +3 |
| Black Hades | Chaos Armor | -2 |
| Blackhand Key | Grave Wand | -2 |
| Blackleach Blade | Bill | -2 |
| Blood Crescent | Scimitar | +4 |
| Bloodrise | Morning Star | +2 |
| Brainhew | Great Axe | +4 |
| Breath of the Dying Rune Word | Weapons | +1 |
| Bright | Jewels | +1 |
| Chance Guards | Chain Gloves | +2 |
| Cloudcrack | Gothic Sword | +2 |
| Crescent Moon | Amulet | -2 |
| Crushflange | Mace | +2 |
| Darksight Helm | Basinet | -4 |
| Darkglow | Ring Mail | +3 |
| Death Rune Word | Axes, Swords | +1 |
| Duskdeep | Full Helm | -2 |
| Fortitude Rune Word | Body Armor, Weapons | +1 |
| Ghostflame | Legend Spike | +2 |
| Gleamscythe | Falchion | +3 |
| Glimmering | Amulets, Armor, Orbs, Rings, Staves, Wands | +1 |
| Gloom Rune Word | Body Armor | -3 |
| Gloom's Trap | Mesh Belt | -3 |
| Glowing | Amulets, Armor, Orbs, Rings, Staves, Wands | +2 |
| Goblin Toe | Light Plated Boots | -1 |
| Goldskin | Full Plate Mail | +2 |
| Goldwrap | Heavy Belt | +2 |
| Guardian Angel | Templar Coat | +4 |
| Hand of Blessed Light | Divine Scepter | +4 |
| Harmony Rune Word | Missile weapons | +2 |
| Hellfire Torch | Charm | +8 |
| Heaven's Brethren | Complete Set | +5 |
| Heaven's Light | Mighty Scepter | +3 |
| Honor Rune Word | Melee weapons | +1 |
| Iceblink | Splint Mail | +4 |
| Immortal King's Will | Avenger Guard | +4 |
| Infernostride | Demonhide Boots | +2 |
| Lenymo | Sash | +1 |
| Lidless Wall | Grim Shield | +1 |
| Light | Amulets, Body Armor, Rings, Scepters, Staves, Wands | +1 |
| Lightsabre | Phase Blade | +7 |
| Lore Rune Word | Helms | +2 |
| Moonfall | Jagged Star | +2 |
| Nadir Rune Word | Helms | -3 |
| Nokozan Relic | Amulet | +3 |
| Nosferatu's Coil | Vampirefang Belt | -3 |
| Pluckeye | Short Bow | +2 |
| Prudence Rune Word | Body Armor | +1 |
| Radiance | Amulets, Bows, Crossbows, Helms, Rings, Scepters, Staves, Wands | +3 |
| Radiance Rune Word | Helms | +5 |
| Rixot's Keen | Short Sword | +2 |
| Schaefer's Hammer | Legendary Mallet | +1 |
| Seraph's Hymn | Amulet | +2 |
| Serpent Lord | Long Staff | -1 |
| Shadowfang | Two-Handed Sword | -2 |
| Silks of the Victor | Ancient Armor | +2 |
| Smoke Rune Word | Body Armor | -1 |
| Spire of Honor | Lance | +3 |
| Spirit Forge | Linked Mail | +4 |
| Splendor Rune Word | Off-hand armor | +3 |
| Steelclash | Kite Shield | +3 |
| Steel Rune Word | Axes, Maces, Swords | +1 |
| Sun | Amulets, Bows, Crossbows, Gloves, Helms, Rings, Scepters, Staves, Wands | +5 |
| The Dragon Chang | Spear | +2 |
| The Eye of Etlich | Amulet | +1-5 |
| The Redeemer | Mighty Scepter | +3 |
| The Rising Sun | Amulet | +4 |
| The Tannr Gorerod | Pike | +3 |
| Tomb Reaver | Cryptic Axe | +4 |
| Torch of Iro | Wand | +3 |
| Umbral Disk | Small Shield | -2 |
| Unbending Will Rune Word | Swords | +1 |
| Veil of Steel | Spired Helm | -4 |
| Venom Ward | Breast Plate | +2 |
| Voice of Reason Rune Word | Maces, Swords | +1 |
| Wind Rune Word | Melee weapons | +1 |
| Woestave | Halberd | -3 |
Diablo III[]
In Diablo III, Light Radius stat is non-existent. Most areas are brightly lit, and in darker ones (and in the night) characters have a static radius of lighting that cannot be changed by any means, and does not affect the gameplay in any way.
A notable exception is the Halls of the Blind quest remake in The Darkening of Tristram: as soon as the player enters the Halls, their light radius is set to zero, making them wander in the pitch dark (unable to see beyond just a few yards, and therefore leaving them open to attack by Hidden).