Rerewharewha
Ko te rama e tukuna ana e te puna rama mo ia wae wa ka kiia ko te rewharewha o te puna marama φ Tohu, ingoa wae: lm (lumens).
kaha marama
Ko te rewharewha marama e tukuna ana e te puna marama i roto i te koki totoka o tetahi ahunga kua tohua ko te kaha o te marama o te puna marama ki tera huarahi, e kiia ana ko I.
I=Rerewharewha i te koki motuhake Ф ÷ Koki motuhake Ω (cd/㎡)
wherikotanga
Ko te rewharewha marama mo ia waeine horahanga mo ia waeine koki totoka o te whakamarama i tetahi ahunga motuhake.E tohuhia ana e L. L=I/S (cd/m2), candela/m2, e mohiotia ana ko te tauine hina.
whakamarama
Ko te rewharewha marama i whakawhiwhia ki ia waeine horahanga, ka whakaatuhia ki te E. Lux (Lx)
E=d Ф/ dS(Lm/m2)
E=I/R2 (R=tawhiti mai i te puna marama ki te rererangi marama)