吸頂(ding)燈(deng)能(neng)直接吸附(fu)在天(tian)花板上，光(guang)(guang)源多以白熾燈(deng)為主，照(zhao)明(ming)(ming)方(fang)式(shi)一般為向(xiang)下投射、散光(guang)(guang)、全(quan)面(mian)(mian)照(zhao)明(ming)(ming)等。選擇(ze)吸頂(ding)燈(deng)尺寸時，先要考慮吸頂(ding)燈(deng)用在什么范(fan)圍。如果(guo)用作客廳光(guang)(guang)源，要選擇(ze)散光(guang)(guang)或(huo)者全(quan)面(mian)(mian)照(zhao)明(ming)(ming)型的(de)；餐廳多選擇(ze)向(xiang)下投射照(zhao)明(ming)(ming)方(fang)式(shi)；臥室光(guang)(guang)源需要柔和，可(ke)選用散光(guang)(guang)照(zhao)明(ming)(ming)。其(qi)次要考慮照(zhao)明(ming)(ming)面(mian)(mian)積(ji)。舉例(li)來說，如果(guo)照(zhao)明(ming)(ming)面(mian)(mian)積(ji)在15平米左右，那么吸頂(ding)燈(deng)直徑(jing)(jing)在40cm為佳；如果(guo)照(zhao)明(ming)(ming)面(mian)(mian)積(ji)在20—35平米，則吸頂(ding)燈(deng)選擇(ze)直徑(jing)(jing)60—70cm比較(jiao)合(he)適。更大的(de)空間可(ke)以選擇(ze)兩(liang)個吸頂(ding)燈(deng)，采用雙照(zhao)明(ming)(ming)模式(shi)。