I have recently had cause to find some KS1 websites on the theme of light and dark – there are some fab ones out there! Here is a selection:
http://www.bbc.co.uk/schools/scienceclips/ages/5_6/light_dark.shtml
http://www.ngfl-cymru.org.uk/vtc/Phase2delivery/Wales/Science/Keystage1/Physicalprocess/Light/Introduction/pop.htm
http://www2.bgfl.org/bgfl2/custom/resources_ftp/client_ftp/ks1/science/colour_and_light/index.cfm
http://www.sciencekids.co.nz/gamesactivities/lightdark.html
Always useful to know…