how to call nested table

local t = {
    ["purple"] = {
        side = "left",
        flux_level = 1,
        flux_max = 7
    },

    ["lime"] = {
        side = "back",
        flux_level = 1,
        flux_max = 7
    },

    ["orange"] = {
        side = "right",
        flux_level = 1,
        flux_max = 7
    },

    ["white"] = {
        side = "front",
        flux_level = 1,
        flux_max = 5
    }
}

----------------------------
--Prints Table for debugging
----------------------------
local function printTable(e)
    if type(e) == "table" then
        for k,v in pairs(e) do -- for every element in the table
            print(k,v)
            printTable(v)       -- recursively repeat the same procedure
            sleep(2)
            print()

        end
    else -- if not, we can just print it
        print(e)
    end
end

---------------------------
--Updates table when redstone changes
---------------------------
local function getUpdate()
    t.purple.flux_level = rs.getAnalogInput(t.purple.side)
    t.lime.flux_level = rs.getAnalogInput(t.lime.side)
    t.orange.flux_level = rs.getAnalogInput(t.orange.side)
    t.white.flux_level = rs.getAnalogInput(t.white.side)
    print("Updated")
    printTable(t)
    sleep(1)
end

---------------------------
--Emits bundled redstone when flux_max is exceeded
---------------------------
local function stopProduction(index)
    if t.["..index.."].flux_level >= t.["..index.."].flux_max then
        print("stopProduction")
        rs.getBundledOutput(colours.index)
    end
end

---------------------------
--Starts the script
---------------------------
local function start()
    while true do
        if os.pullEvent("redstone") then
            --getUpdate() -- updates table
            stopProduction(purple)
        end
    end
end

start()


stopProduction(purple)