Chithandizo cha kuwala chakhalapo kuyambira nthawi imene zomera ndi zinyama zinali padziko lapansi, chifukwa tonsefe timapindula pang'ono ndi kuwala kwa dzuwa.
Kuwala kwa UVB kochokera ku dzuwa sikumangogwirizana ndi cholesterol pakhungu kuti kuthandize kupanga vitamini D3 (potero kumapindulitsa thupi lonse), komanso gawo lofiira la spectrum yowoneka bwino (600 - 1000nm) limalumikizananso ndi enzyme yofunika kwambiri mu mitochondria ya selo lathu, zomwe zimakweza chivindikiro cha mphamvu zathu zopangira mphamvu.
Chithandizo cha kuwala kwamakono chakhalapo kuyambira kumapeto kwa zaka za m'ma 1800, pasanapite nthawi yaitali magetsi ndi magetsi apakhomo atayamba kugwiritsidwa ntchito, pamene Niels Ryberg Finsen, yemwe anabadwira ku Faroe Islands, anayesa kugwiritsa ntchito kuwala ngati mankhwala a matenda.
Pambuyo pake Finsen adapambana mphoto ya Nobel ya zamankhwala mu 1903, chaka chimodzi asanamwalire, ndipo adapambana kwambiri pochiza nthomba, lupus ndi matenda ena a pakhungu ndi kuwala kowala.
Chithandizo choyambirira cha kuwala chinali chogwiritsa ntchito mababu achikhalidwe, ndipo maphunziro 10,000 achitika pa kuwala m'zaka za m'ma 1900. Maphunziro osiyanasiyana amachokera ku zotsatira pa nyongolotsi, kapena mbalame, amayi apakati, akavalo ndi tizilombo, mabakiteriya, zomera ndi zina zambiri. Chitukuko chaposachedwa chinali kuyambitsa zipangizo za LED ndi ma laser.
Pamene mitundu yambiri inkapezeka monga ma LED, ndipo luso la ukadaulo linkayamba kukwera, ma LED anakhala chisankho chanzeru komanso chothandiza kwambiri pa chithandizo cha kuwala, ndipo ndi muyezo wa makampani masiku ano, ndipo luso likupitirizabe kukwera.