除湿止寒， 舒经络（痼冷，以体曝之，则血和而病去。冬月以旧帛晒，受阳气，覆体，
皆
能却疾）。补脾养胃（作酱日晒，受日气多，人食之，多补脾胃）。久服长生（养生家有服日
光
法）。
辟伏尸（陈子静养生注云∶火殃即流星之精，入土中，其地有伏尸皆远去）。增志虑聪
明。（
谈道录，有制星精米法，以白米露星月下，百日，承受星精，小儿食之，多聪明，增神智，
且辟邪除疟）
除瘟疫，却四时不正之气。周礼司 掌火政，四时变火以救时疾，即此。杀精魅。凡一
切山
魈木怪，年老精魅，用千年古柏，不得以凡火燃，须钻木按时取火燃之。
沈云将食纂∶榆柳火助养生之气，利肝胆，调筋脉，枣杏火消蕃茂之气，养心血，通神明，
柞火敛耗散秉元清，利肺而滋本源，制阳而结髓，槐檀火补肾脏，益阴血，使遍体调和，
周身通畅。桑柘火补脾胃，壮真元。
宜针灸百病，取其含阴气于阳中，有太极之妙。张石顽以石取火为阴火，云不宜以之灼
艾，
以太阳取于阳燧者为阳火。宜灸病。不知石虽阴质，非真火蕴结则不成形。凡石中皆有火，
火石较他石尤火多而易取者，以此石独受太阳之气浓也。石阴而火阳，必受击乃出，火多者
且有 炸声，若阴火则无声矣。故濒湖列为地之阳火，石顽以为阴火，未免拘墟之见耳。
除湿寒，疏通经络（对于顽固性的寒冷病症，通过让身体暴晒于阳光下，能使血液调和而疾病去除。冬季用旧丝织品在阳光下晾晒，使其吸收阳气，再覆盖在身体上，都能起到祛除疾病的作用）。补益脾胃（制作酱料时进行日晒，能吸收较多的日光之气，人食用后，多能补益脾胃）。长期服用可延年益寿（养生家中有服用日光的方法）。
驱除伏尸鬼疰（陈子静在养生注中说：火殃即流星的精华，落入土中，该地若有潜伏的尸气都会远离）。增强意志与思维敏捷度。（《谈道录》记载有制作星精米的方法，将白米暴露在星光月光下，经过一百天，以承受星辰的精华，小儿食用后，大多变得聪明，增加神智，并且能辟邪除疟疾）
消除瘟疫，抵御四季不正之气。《周礼》中掌管火政的官员，四季变换火种以救治时令疾病，指的就是这种方法。杀灭精魅妖怪。凡是各种山魈木怪、年老成精的魅惑之物，需用千年的古柏树来点燃，不能用普通的火去烧，必须按照时辰钻木取火来点燃它。
沈云在《食纂》中说：榆柳之火助长养生的正气，利于肝胆，调理筋脉；枣杏之火消散繁茂过剩之气，滋养心血，通达神明；柞木之火收敛耗散之气，秉承清纯本源，利于肺部并滋补肾源，制约阳气并凝结骨髓；槐檀之火补益肾脏，增益阴血，使全身调和，周身通畅；桑柘之火补益脾胃，壮大真元。
适宜用针灸治疗百病，因为石头含有“阳中之阴”，具有太极的奥妙。张石顽认为从石头中取得的火为“阴火”，说不宜用它来灸艾，认为从太阳镜（阳燧）中取得的火才是“阳火”，适宜用来灸病。他不知道石头虽然是阴质，但如果没有真火的蕴结就不能成形。凡石头中都有火，火石比其他石头火气更多且更容易取得的原因，是因为这种石头特别浓烈地接受了太阳之气。石头属阴而火属阳，必须经过敲击才能发出火来，火多的石头甚至会有爆炸声，如果是阴火则是没有声音的。所以李濒湖将其列为地的阳火，而张石顽却认为是阴火，这未免是拘泥狭隘的见解罢了。
Dispels dampness and cold, unblocks meridians (for chronic cold conditions, exposing the body to sunlight harmonizes the blood and eliminates disease. In winter, old silk fabrics sun-dried to absorb solar yang energy can be covered on the body to drive away illness). Tonifies spleen and stomach (fermented paste sun-dried absorbs abundant solar qi; consuming it tonifies the spleen and stomach). Long-term use promotes longevity (health preservationists have methods of ingesting solar light).
Expels "Fushi" (latent corpse-qi/ghostly diseases) (Chen Zijing noted in his health preservation commentary: "Huoyang" is the essence of meteors; when it enters the earth, any latent corpse-qi in that area will disperse). Enhances willpower and mental acuity. ("Tandao Lu" records a method for preparing "Star Essence Rice": white rice is exposed to starlight and moonlight for one hundred days to receive stellar essence; children who eat it often become smarter, gain spiritual intelligence, and ward off evil and malaria.)
Eliminates plagues and repels the irregular qi of the four seasons. The official in charge of fire administration in the *Rites of Zhou* changed fires in the four seasons to save people from seasonal epidemics, referring to this practice. Kills spirits and demons. For all kinds of mountain goblins, tree monsters, and ancient spirit demons, one must use thousand-year-old cypress wood; ordinary fire should not be used to ignite them, but rather fire must be obtained by drilling wood according to specific times.
Shen Yun in *Shi Zuan* states: Fire from elm and willow assists the qi of health preservation, benefits the liver and gallbladder, and regulates sinews and vessels; fire from jujube and apricot dissipates excessive luxuriant qi, nourishes heart blood, and opens the spirit; fire from oak gathers dissipating qi, inherits pure primordial essence, benefits the lungs, nourishes the root source, restrains yang, and consolidates marrow; fire from locust and sandalwood tonifies the kidneys, benefits yin blood, harmonizing the whole body and ensuring smooth circulation throughout; fire from mulberry and Chinese tallow tree tonifies the spleen and stomach, and strengthens true yuan.
Suitable for acupuncture and moxibustion for various diseases, as stone contains yin within yang, possessing the wonder of the Supreme Ultimate (Taiji). Zhang Shiwan considered fire taken from stone as "Yin Fire," claiming it is unsuitable for moxibustion with mugwort, asserting that fire taken from the sun mirror (Yang Sui) is "Yang Fire" and suitable for moxibustion. He did not realize that although stone is a yin substance, it cannot take form without the accumulation of true fire. All stones contain fire; firestones have more fire and are easier to obtain than other stones because they uniquely receive intense solar qi. Stone is yin and fire is yang; fire must be struck out. Stones with abundant fire may even make a cracking sound, whereas yin fire produces no sound. Therefore, Li Binhu classified it as Earth's Yang Fire, while Zhang Shiwan regarded it as Yin Fire, which is undoubtedly a narrow-minded view.