lux.js

#!/usr/bin/env node

var request = require('request');
var given = process.argv.splice(2);

function command(args) {
    var payload = {};

    if (args[0]) payload.power = args[0];
    if (parseFloat(args[1])) payload.brightness = parseFloat(args[1]);
    if (args[2]) payload.color = args[2];
    if (parseFloat(args[3])) payload.duration = parseFloat(args[3]);

    request({
        uri: "https://api.lifx.com/v1/lights/all/state", // custom selectors?
        method: "PUT",
        headers: {
            "Authorization": "Bearer lifx_api_token"
        },
        json: true,
        body: payload
    }, function(err, res, body) {
        if (given.indexOf("verbose") > -1) console.log(body);
    });

};

if (
    (given[0] == "off" || given[0] == "on")
    && ((parseFloat(given[1]) < 1 && parseFloat(given[1]) > 0) || !given[1] )
    && (typeof given[2] === "string" || !given[2])
    && (typeof parseFloat(given[3]) === "number" || !given[3])
   ) {
    command(given);
} else {
    console.log("lux [on|off] [0-1] [color] [seconds] [verbose (optional)]");
}