Luminous efficiency:
Nws yog qhov sib piv ntawm cov luminous flux nws tso tawm faib los ntawm nws lub zog siv, chav tsev yog lumens ib watt (Im/w) [lub teeb pom kev zoo (lm/wl=lumens liml-power noj (W)] ib watt ntawm hluav taws xob Txhawm rau siv sijhawm ntev dua, xws li chav ua haujlwm hauv tsev, txoj kev hauv tsev, tsev so, thiab lwm yam.
Xim kub:
Hais txog thaum lub teeb ci ntawm lub teeb pom kev zoo ib yam li lub teeb xim tso tawm los ntawm lub cev dub tsis tseeb ntawm qee qhov Kelvin kub {K}, qhov kub Kelvin no yog lub teeb xim kub ntawm lub teeb ci, hu ua xim kub. Kelvin yog Kelvin. Nws tau hais tawm los ntawm K. Nws yog chav ntsuas ntsuas kub thiab ib qho ntawm cov hauv paus tseem ceeb ntawm International System (si). Celsius yog sib npaug rau Kelvin ntxiv rau 273. 2700K txiv kab ntxwv lub teeb xim 3000K-sov tus kheej xim 3500K tus kheej xim 4000K -Cool xim 5000K nruab hnub nrig xim 6500K-txias hnub ci xim.
