吸(xi)(xi)頂(ding)燈(deng)能直(zhi)接吸(xi)(xi)附在(zai)(zai)天花板(ban)上，光(guang)源(yuan)(yuan)多以白熾(chi)燈(deng)為(wei)主，照(zhao)(zhao)明(ming)(ming)(ming)方式(shi)一(yi)般為(wei)向下投射、散光(guang)、全面(mian)照(zhao)(zhao)明(ming)(ming)(ming)等。選(xuan)擇吸(xi)(xi)頂(ding)燈(deng)尺寸時，先要考慮(lv)吸(xi)(xi)頂(ding)燈(deng)用在(zai)(zai)什么(me)范圍。如(ru)果用作(zuo)客廳(ting)光(guang)源(yuan)(yuan)，要選(xuan)擇散光(guang)或者全面(mian)照(zhao)(zhao)明(ming)(ming)(ming)型的；餐(can)廳(ting)多選(xuan)擇向下投射照(zhao)(zhao)明(ming)(ming)(ming)方式(shi)；臥(wo)室光(guang)源(yuan)(yuan)需要柔和，可選(xuan)用散光(guang)照(zhao)(zhao)明(ming)(ming)(ming)。其次要考慮(lv)照(zhao)(zhao)明(ming)(ming)(ming)面(mian)積(ji)。舉例來說，如(ru)果照(zhao)(zhao)明(ming)(ming)(ming)面(mian)積(ji)在(zai)(zai)15平(ping)米左右，那么(me)吸(xi)(xi)頂(ding)燈(deng)直(zhi)徑在(zai)(zai)40cm為(wei)佳；如(ru)果照(zhao)(zhao)明(ming)(ming)(ming)面(mian)積(ji)在(zai)(zai)20—35平(ping)米，則吸(xi)(xi)頂(ding)燈(deng)選(xuan)擇直(zhi)徑60—70cm比較合適。更大的空間(jian)可以選(xuan)擇兩個吸(xi)(xi)頂(ding)燈(deng)，采用雙(shuang)照(zhao)(zhao)明(ming)(ming)(ming)模式(shi)。