I would check where you placed your objects in relation to where the light is located. This quick example shows the green on the side of the cubes. Use the arrow keys to move around.
sync on : sync rate 60
autocam off : randomize timer()
backdrop on : color backdrop 0
hide mouse
make object box 1,1000,10,1000
position object 1,0,-5,0
color object 1,rgb(0,0,255) : set object ambience 1,rgb(0,0,255)
for i = 2 to 10
make object cube i,rnd(2) + 1
x# = rnd(25) - 30 : z# = rnd(25) + 140
position object i,x#,object size y(i) * .5,z#
r = 226 : g = 226 : b = 226
color object i,rgb(r,g,b) : set object ambience i,rgb(r,g,b)
next i
make light 1 : color light 1,0,255,0
position light 1,0,30,0
position light 1,-30.7828,15,147.699
set light range 1,40
position camera -30,1,147
point camera 0,1,100
repeat
control camera using arrowkeys 0,1.0,5
sync
until spacekey() = 1
show mouse
end