Ka tatauhia te horopeta whakaora mārama mā tēnei tātai:
Te Kīanga Mana x Te Wā = Te Inenga
Waimarie, ko te nuinga o ngā rangahau hou e whakamahi ana i ngā waeine paerewa hei whakaahua i tā rātou kawa:
Te Matū Mana i roto i te mW/cm² (milliwatts ia henimita tapawhā)
Te wā i roto i ngā hēkona (hēkona)
Te horopeta i roto i te J/cm² (Joules ia henimita tapawhā)
Mō te whakaora mārama i te kāinga, ko te mātotoru o te mana te mea matua me mōhio koe – ki te kore koe e mōhio, e kore e taea e koe te mōhio kia pēhea te roa o te whakamahinga o tō taputapu kia tutuki ai tētahi horopeta. He ine noa iho tēnei i te kaha o te mārama (e hia rānei ngā photon kei roto i tētahi wāhi o te ātea).
Ki ngā LED putanga koki, ka horapa te mārama i a ia e neke ana, ka kapi i tētahi wāhi whānui ake. Ko te tikanga ka ngoikore haere te kaha o te mārama i tētahi wāhi i te mea ka piki haere te tawhiti mai i te pūtake. Ka pāngia hoki te mātotoru o te mana e ngā rerekētanga o ngā koki hihi i runga i ngā LED. Hei tauira, ka tukuna e te LED 3w/10° te mātotoru o te mana o te mārama ki tua atu i te LED 3w/120°, ka tukuna e tēnei he mārama ngoikore ki tētahi wāhi nui ake.
Ko ngā rangahau whakaora mārama e whakamahi ana i ngā mātotoru mana o te ~10mW/cm² tae atu ki te mōrahi ~200mW/cm².
Ko te horopeta e whakaatu ana i te roa o te wā i whakamahia ai taua kaha. Ko te kaha ake o te mārama he iti ake te wā e hiahiatia ana mō te whakamahinga:
Mā te 5mW/cm² e tāpirihia ana mō te 200 hēkona ka puta ko te 1J/cm².
Mā te 20mW/cm² e tāpirihia ana mō te 50 hēkona ka puta ko te 1J/cm².
Mā te 100mW/cm² e tāpirihia ana mō te 10 hēkona ka puta ko te 1J/cm².
Mā ēnei waeine o te mW/cm² me ngā hēkona ka puta te hua i roto i te mJ/cm² – whakareatia noa tēnā ki te 0.001 hei whiwhi i te J/cm². Nō reira, ko te tātai katoa, me te whakaaro ki ngā waeine paerewa, koia tēnei:
Horomanga = Te Kīanga Mana x Te Wā x 0.001