Space Lights are lights that come in tungsten, HMI, and LED.  They are used for lighting large areas of your sets.  I use them for creating day ambience outside of sets on stage. 

They hang just down from the ceiling and create a very large source when grouped together.  I have used them to light green and blue screen environments. I use them to light white cyc’s evenly.  They project the light down and out the sides of a silk skirt that dangles down 2 to 3 feet from the source.