Qee cov neeg tuaj tshiab rau kev tshaj tawm feem ntau xav paub yuav ua li cas rau tus nqi thiab suav cov cim teeb pom kev zoo. Raws li cov kev coj ua thiab cov kev cai hauv kev lag luam, ntawm no yog qhov kev tawg: Feem ntau, muaj peb qhov xwm txheej:
1. Rau illuminated cim tshaj 1 meter, cheeb tsam yog xam raws li ntev * ntev. Nqe=cheeb tsam * nqe ib square meter. Piv txwv li, yuav ua rau ib tug kos npe rau 1.2 meters siab thiab 1 meter dav, luv nqi ntawm 800 yuan ib square meter, tus nqi=cheeb tsam 1.2 * 1.2 (raws li qhov loj tshaj stroke * loj tshaj stroke) * 800=1152 yuan.
2. Rau illuminated kos npe nyob rau hauv 1 meter, cheeb tsam yog xam raws li qhov ntev stroke * nqi ib centimeter. Piv txwv li, ua kom pom lub teeb pom kev zoo 60 centimeters siab thiab 40 centimeters dav, luv nqi ib centimeter, ntawm 8 yuan ib centimeter, tus nqi=60 (raws li qhov loj tshaj plaws stroke) * 8=480 yuan.
3. Rau cov cim qhia hauv qab 20 centimeters, tus nqi yog xam rau ib chav tsev, raws li lub tuam txhab tus nqi.