In D&D 5e, light sources shape exploration, combat, and survival in dim environments. This guide explains how bright and dim radii work, the differences between light, sun, and darkness, and how creatures with darkvision or tremorsense interact with illumination. You will learn the practical impact of carrying torches versus lanterns, how darkness penalties affect checks, and how spellcasters use light-concentration mechanics. Understanding these rules helps you plan routes, set ambushes, and allocate resources so your party navigates dungeons and wilderness predictably and safely.
Core Rules for Bright and Dim Light
Many light sources in 5e specify a bright radius and a dim radius. A bright radius sheds normal light, while the dim radius provides dim light out to twice that distance. Beyond the dim radius is darkness, with key exceptions for creatures that have darkvision or other supernatural sight. These ranges are always expressed in feet and represent a circular area centered on the light source unless a specific shape is noted. Wind and obstacles can obscure or snuff open flames, so GMs may call for checks to keep a torch or lamp burning in storms or crowded corridors.
Darkvision, Superior Darkvision, and Light Sensitivity
Darkvision lets creatures see in darkness as if it were dim light, while superior darkvision treats darkness as normal light. Light sensitivity works in reverse: bright light imposes disadvantage on sight-based checks for creatures adapted to darkness. This symmetry means illumination can both reveal and hinder, giving an edge to parties that anticipate how monsters use or avoid light. When designing a character build or tactic, consider whether you want to exploit darkvision or avoid light sensitivity in your adventures.
Common Light Sources and Their Practical Traits
Players choose light sources based on duration, portability, and stealth implications. Torches are cheap and bright but fragile, whereas lanterns offer longer, more controllable illumination at higher cost. Some magic items trade brightness for concealment, while certain spells generate light without consuming physical fuel. Weighing factors like fuel, noise, and ease of extinguishing can make the difference between a stealthy approach and an unavoidable confrontation.
Torches and Hand Lanterns
A torch burns for 1 hour and sheds bright light in a 20-foot radius and dim light for an additional 20 feet. It is easily snuffed by water or wind and can be used to deliver ongoing fire damage with a simple action. A hand lantern brightens a 20-foot radius with a steady glow and usually requires oil, which is inexpensive but adds inventory weight. Both are straightforward options for dungeon delving, but they create visible light and modest noise that alert observant foes.
Lanterns, Campfires, and Continual Flame
A hooded lantern provides a 15-foot bright radius and a 15-foot dim radius, remaining lit even in windy conditions and allowing the bearer to snuff or relight it as an action. Campfires illuminate a 10-foot radius in a 30-foot hemisphere, remaining lit until extinguished by actions or conditions, and function during an hourlong rest to provide warmth and light. The spell continual flame fixes a light source at a set brightness, requires concentration, and can be dismissed or maintained as needed, offering flexibility that material lights cannot match.
Duration, Cost, and Tactical Trade-offs
Resource planning for light revolves around time, money, and risk. Torches and oil are inexpensive but perishable, while lanterns, hooded or otherwise, have higher upfront costs but longer lifespans per unit of fuel. Magic items or concentration spells shift costs into attunement slots or spell slots in exchange for reliability and portability. Below is a high-information summary of typical light sources, their ranges, approximate cost, average duration, and key tactical considerations.
| Light Source | Bright / Dim Radius (ft) | Duration or Fuel | Typical Cost | Tactical Notes |
|---|---|---|---|---|
| Torch | 20 / 20 | 1 hour | 1 sp | Cheap, noisy, fragile, can be used as a weapon |
| Hand Lantern | 20 / 20 | 10 hours with oil | 50 gp | Weather-resistant, heavier, requires oil |
| Hooded Lantern | 15 / 15 | 50 hours | 60 gp | Windproof, snuff-able, reduces light radius |
Spells and Magical Light
Several spells generate light without relying on physical fuel. Light, at first level, creates a torch-sized flame you can cast on an object or as a beam, and it remains while concentration holds. Dancing lights offers more flexibility, producing up to four floating lights that each mimic a torch, but also demand concentration. For long-term, low-maintenance illumination, continual flame is a strong option, anchoring a fixed light source that does not require concentration after casting. These tools let spellcasters control brightness, portability, and visibility with fine-grained control, at the cost of limited spell slots or components.
Darkness, Dim Light, and Ambient Effects
Magical darkness, such as that created by the darkness spell, blocks normal light and imposes heavily obscured conditions on creatures without darkvision. Even nonmagical darkness follows the same radius logic: beyond a dim light’s range, areas are heavily obscured for beings that rely on sight. Creatures with darkvision or tremorsense can navigate these zones, but social stealth and ranged tactics are harder without illumination. Understanding how light interacts with darkness helps you choose when to carry a torch, snuff a lantern, or rely on supernatural sight to move unseen.
Visibility, Stealth, and Environmental Factors
Light affects perception checks and stealth checks, since bright light typically grants advantage to passive Perception checks of creatures that rely on sight. In contrast, characters in bright light suffer disadvantage on Dexterity (Stealth) checks unless they have cover or special abilities. Wind, weather, and terrain can obscure flames, extinguish torches, or snuff hooded lanterns on critical failure checks, so plan contingencies. Carrying multiple light sources, using muffled equipment, or relying on darkvision can balance the need for illumination with the need for discretion.
Party Roles and Light Loadouts
Clerics, wizards, and artificers often carry or prepare light control options, while rogues and scouts may prefer dim or no light to maximize stealth. A simple loadout strategy might include a hooded lantern as a primary light source, a torch for immediate fire effects, and a spell slot or cantrip for emergency illumination. For parties with darkvision-capable members, you can reduce carried light without sacrificing mobility, trading weight for flexibility. Match your choices to your environment: bright dungeons favor reliable lanterns, while night ambushes favor darkness and subtle magical light.