View source for Light source

'''Light sources''' cast [[light]] over a number of squares. To light any light source, use the [[apply]] command, {{kbd|a}}.

Lit areas can be displayed in brighter characters using the game [[option]] lit_corridor.

==Table of light sources==

Light sources are generated to stay lit for the number of turns in the table below. They are generated in the quantity and [[BUC]] state shown. Cursed light sources will sometimes not light.

{|class="prettytable striped sortable"
!Light source 
!Radius
!Turns
!Weight
!Generated
|-
|potion of oil
|1
|400
|20
|12.5% blessed, 75% uncursed, 12.5% cursed
|-
|tallow candle
|2
|200
|2
|1 to 7; 10% blessed, 80% uncursed, 10% cursed
|-
|wax candle
|2
|400
|2
|1 to 7; 10% blessed, 80% uncursed, 10% cursed
|-
|brass lantern
|3
|1000 to 1499
|30
|10% blessed, 80% uncursed, 10% cursed
|-
|magic lamp
|3
|Infinite
|20
|25% blessed, 50% uncursed, 25% cursed
|-
|oil lamp
|3
|1000 to 1499
|20
|10% blessed, 80% uncursed, 10% cursed
|-
|Sunsword
|3/2/1 (B/U/C)
|Infinite
|40
|10% blessed, 80% uncursed, 10% cursed
|-
|Candelabrum of Invocation
|4
|See below
|10 (empty) &ndash; 24 (with 7 candles)
|Unique item
|}
Prior to [[3.6.1]], the Candelabrum always weighed 10 aum regardless of the number of candles attached.

{{upcoming|NetHack 3.7.0|New light sources are added: [[gold dragon scales]] (radius 3/2/1 (B/U/C)) and [[gold dragon scale mail]] (radius 4/3/2 (B/U/C))}}

==The Candelabrum==

{{main|Candelabrum of Invocation}}

Candles can be applied to the [[Candelabrum of Invocation]]. The Candelabrum acts like an ordinary light source if at least one candle is applied to it. It will burn as many turns as the shortest-lived{{refsrc|src/apply.c|1162|version=NetHack 3.6.0}} candle attached to it. However, each time you light it anywhere other than on the [[vibrating square]], the remaining life will immediately be cut in half{{refsrc|src/apply.c|1107|version=NetHack 3.6.0}} ("The candles are being rapidly consumed!"). The Candelabrum will not light if cursed.

Light radius 4:
{{lightradius|r=4}}

==Lanterns and lamps==

{{tool|name=oil lamp|tile=[[image:lamp.png]]|appearance=lamp|cost=10|weight=20|color=yellow|material=copper}}
{{tool|name=brass lantern|tile=[[image:brass_lantern.png]]|appearance=brass lantern|cost=20|weight=30|color=yellow|material=copper}}

Brass lanterns and [[oil lamp|oil lamps]] can be refilled by [[charging]] them; blessed charging will refill them to 1500 turns, and uncursed charging will add 750 turns to a maximum of 1500. An oil lamp with 1000 or fewer turns left can also be refilled by #[[dip]]ping it into a [[potion of oil]], getting twice the remaining turns left in the potion. (Attempting to refill an oil lamp with a ''lit'' potion of oil, or while the lamp is lit, will cause an explosion dealing 6d6 points of damage). No lamp can be filled beyond 1500 turns.

Light radius 3: 
{{lightradius|r=3}}

===Magic lamps===

{{tool|name=magic lamp|tile=[[image:lamp.png]]|appearance=lamp|cost=50|weight=20|color=yellow|material=copper}}

{{main|Magic lamp}}

Magic lamps never run out of power, and may summon a [[djinni]] and lead to a [[wish]] when #[[rub|rubbed]].

==Sunsword==

{{main|Sunsword}}

Light radius: 3 if blessed, 2 if uncursed, and 1 if cursed.{{refsrc|src/light.c|676|version=NetHack 3.6.1}}
{{lightradius|r=3}} {{lightradius|r=2}} {{lightradius|r=1}}
The artifact weapon [[Sunsword]] will act as a light source whenever [[wield]]ed, either by you or by a monster.

==Candles==

{{tool|name=tallow candle|tile=[[image:candle.png]]|appearance=candle|cost=10|weight=2|color=white|material=wax}}
{{tool|name=wax candle|tile=[[image:candle.png]]|appearance=candle|cost=20|weight=2|color=white|material=wax}}

The only differences between wax and tallow candles are their lifespans (400 turns for a wax candle, 200 for tallow), value, and that eating tallow candles breaks vegetarian conduct. You can mix different candle types on the [[Candelabrum of Invocation|Candelabrum]], though it will burn only as long as the shortest-lived candle.

=== Generation ===

Candles can be randomly generated or wished for, but some can nearly always be found in [[Izchak]]'s lighting shop in [[Minetown]], some [[gnomes]] will generate carrying them, and the top floor of [[Vlad's Tower]] always includes at least eight candles. When you wish for candles, you can specify up to seven (the number needed on the Candelabrum) and are guaranteed to receive that many.

=== Effects ===

Light radius 2:
{{lightradius|r=2}}

A single candle has a light radius of 2; the radius increases by one for every additional power of 7. Therefore, a stack of 7 candles lights up a 3 square radius, 49 a 4 square radius, 343 a 5 square radius and so forth{{refsrc|src/light.c|617|version=NetHack 3.6.0}}.

Candles hold a special place in the game, as seven of them are needed for the [[invocation ritual]]. They must be attached to the Candelabrum of Invocation before you begin the ritual proper, although they may have been partially burnt beforehand, and you may freely mix wax and tallow, blessed, uncursed, and cursed candles.

{{upcoming|NetHack 3.7.0|The light radius of a lit stack of candles now grows as the square root of the number of candles instead of logarithmically. 4 candles now gives a radius of 3, 9 candles gives 4, and so on. Only 16 candles are now required to get a larger light radius than the Candelabrum of Invocation.}}

=== History ===

Seven candles are the only non-unique items that are required to win the game, but in versions of NetHack prior to [[NetHack 3.6.0|3.6.0]] (and some variants based on such versions) they were not guaranteed to appear at any point in the [[Mazes of Menace]]. Izchak's lighting shop was guaranteed, but [[Minetown]] is a possible [[bones]] level, and even a fresh shop was not guaranteed to have the requisite seven. It was therefore possible not to find enough randomly generated candles to perform the invocation, and players had to resort to [[polypiling]] tools, using a [[wish]] (a wish will always produce up to seven candles, in an exception to the ordinary mechanics of wishing for multiple items), and less-savory techniques such as [[pudding farming]].

As of 3.6.0, the top level of [[Vlad's Tower]] now contains two stacks of 4-8 wax and tallow candles and is ineligible for bones, so every game is guaranteed to generate a minimum of eight candles regardless of the player's [[conduct]]s.

==Monster light sources==
Currently all monsters that emit light create a light of radius 1 around themselves. Light-emitting monsters{{refsrc|include/mondata.h|151|version=NetHack 3.6.0}} are {{monsymlink|yellow light}}, {{monsymlink|black light}}, {{monsymlink|flaming sphere}}, {{monsymlink|shocking sphere}}, {{monsymlink|fire vortex}} and {{monsymlink|fire elemental}}.

In the following chart, {{white|@}} is the light-emitting monster and {{yellow|x}} is the area lit by it.
{{lightradius|r=1}}

==Encyclopedia==
===Brass lantern===
{{encyclopedia|
While pretending to be a fancy safety lamp, it is in fact battery powered.  A discreet little switch is marked "on/off" in elaborate lettering.|[ Adventure 770, by Mike Arnautov ]}}

===Lamp===
The entry is the same for both oil and magic lamps:
{{encyclopedia|When he came to himself he told his mother what had passed, and showed her the lamp and the fruits he had gathered in the garden, which were in reality precious stones.  He then asked for some food.

"Alas! child," she said, "I have nothing in the house, but I have spun a little cotton and will go and sell it."

Aladdin bade her keep her cotton, for he would sell the lamp instead.  As it was very dirty she began to rub it, that it might fetch a higher price.  Instantly a hideous genie appeared, and asked what she would have.  She fainted away, but Aladdin, snatching the lamp, said boldly: "Fetch me something to eat!"|[ Aladdin, from The Arabian Nights, by Andrew Lang ]}}

===Candle===
The entry is the same for both tallow and wax candles, as well as the [[Candelabrum of Invocation]]:
{{encyclopedia|Faustus: Come on Mephistopheles.  What shall we do?
Mephistopheles: Nay, I know not.  We shall be cursed with bell, book, and candle.
Faustus: How?  Bell, book, and candle, candle, book, and bell,
Forward and backward, to curse Faustus to hell.
Anon you shall hear a hog grunt, a calf bleat, and an ass bray,
Because it is Saint Peter's holy day.
(Enter all the Friars to sing the dirge)
|[ Doctor Faustus and Other Plays, by Christopher Marlowe ]}}

==SLASH'EM==
[[SLASH'EM]] adds new light emitting monsters, and modifies some existing monsters to have larger light radii. All [[Light_(monster_class)|lights]] and [[fire vortex|fire vortices]] have a light radius of 3. [[Fire elemental]]s and [[fire vampire]]s have a light radius of 2. [[flaming sphere|Flaming]] and [[shocking sphere|shocking]] spheres and [[wax golem]]s have a light radius of 1.

Wax golems drop wax candles when destroyed, making candles more common.

[[Magic candle|Magic candles]], candles that aren't consumed when used, are also added in SLASH'EM.

==See also==

* [[wand of light]]
* [[scroll of light]]
* [[spellbook of light]]

==References==
<references />

{{DOD}}
{{nethack-362}}
[[Category:Tools]]