Part of the code works in one spot and not the other, how do I fix this?

Light = game.Workspace.Lamp.LightPart
Time = 0

while true do
    Time = Time+4
    game.Lighting:SetMinutesAfterMidnight(Time)
    wait(.1)

    if game.Lighting:GetMinutesAfterMidnight == 6 * 60 then
        Light.Material = Enum.Material.Plastic
        Light.PointLight.Enabled = false
    end 
    if game.Lighting:GetMinutesAfterMidnight == 18 * 60 then
        Light.Material = Enum.Material.Neon
        Light.PointLight.Enabled = true
    end
end

That's the code I'm using to turn a lamp on and of at certain times in the day but in the first "if then" statement "==" cause an error because it expects a ( or { how do I fix this (And yes the is the Wiki's Tutorial day/night script).