Double Bollinger Bands Forex Strategy

I came across Kathy Lien talk about Double Bollinger Band strategy quite a lot.
More information concerning the usage of the strategy is best explained by Kathy Lien in her YouTube webinars.
Basically there are two Bollinger Bands:
1. 20 Period, 1 Standard Deviation
2. 20 Period, 2 Standard Deviation
Recommended Time Frame is Daily or 4 Hours.
Basically we want the currency pair to roll over close below the 1 Standard Deviation (Green Band). This tells us the up-trend has broken, the momentum has been lost and the currency pair is now reversing. We then Short it at the next candle.