You're current tornado light is 1460lm and the hue color is 806lm, so it will be less bright.
You do need the bridge to control the hue light, without it you can it only turn on and off with the normal light switch.
The phone app connects to the bridge by wifi and the bridge connects to the lamp by radio signals (zigbee).
If you go for the hue, look for a starters package, it will have all you need and is mostly cheaper.
One warning, if you start with hue, you want more