Mlingo wa chithandizo cha kuwala umawerengedwa ndi fomula iyi:
Kuchuluka kwa Mphamvu x Nthawi = Mlingo
Mwamwayi, maphunziro aposachedwapa amagwiritsa ntchito mayunitsi okhazikika pofotokoza njira yawo:
Kuchuluka kwa Mphamvu mu mW/cm² (milliwatts pa sentimita imodzi sikweya)
Nthawi mu masekondi (masekondi)
Mlingo mu J/cm² (ma Joules pa sentimita imodzi sikweya)
Pa chithandizo cha kuwala kunyumba, kuchuluka kwa mphamvu ndiye chinthu chachikulu chomwe muyenera kudziwa - ngati simukudziwa, simudzatha kudziwa nthawi yomwe mungagwiritse ntchito chipangizo chanu kuti mupeze mlingo winawake. Ndi muyeso wongoyerekeza mphamvu ya kuwala (kapena kuchuluka kwa ma photon m'dera linalake).
Ndi ma LED otulutsa ngodya, kuwala kumafalikira pamene kukuyenda, kuphimba dera lalikulu komanso lalikulu. Izi zikutanthauza kuti mphamvu ya kuwala kulikonse imachepa pamene mtunda kuchokera ku gwero ukuwonjezeka. Kusiyana kwa ma angles a kuwala pa ma LED kumakhudzanso kuchuluka kwa mphamvu. Mwachitsanzo, LED ya 3w/10° idzawonetsa kuchuluka kwa mphamvu ya kuwala kuposa LED ya 3w/120°, yomwe idzawonetsa kuwala kofooka pamalo akuluakulu.
Kafukufuku wokhudza kuwala amagwiritsa ntchito mphamvu ya ~10mW/cm² mpaka ~200mW/cm².
Mlingo ukungokuuzani nthawi yomwe mphamvuyo inagwiritsidwa ntchito. Kuwala kwakukulu kumatanthauza kuti pamafunika nthawi yochepa yogwiritsira ntchito:
5mW/cm² yogwiritsidwa ntchito kwa masekondi 200 imapereka 1J/cm².
20mW/cm² yogwiritsidwa ntchito kwa masekondi 50 imapereka 1J/cm².
100mW/cm² yogwiritsidwa ntchito kwa masekondi 10 imapereka 1J/cm².
Mayunitsi awa a mW/cm² ndi masekondi amapereka zotsatira mu mJ/cm² - ingochulukitsani ndi 0.001 kuti mupeze J/cm². Chifukwa chake, njira yonse, poganizira mayunitsi wamba ndi iyi:
Mlingo = Kuchuluka kwa Mphamvu x Nthawi x 0.001