My idea is:
A. If you switched to LED, don't switch back even the saving is 0.80 cents/month. A saving is saving and why incur extra cost to switch back?
B. AC is not the only heavy energy user. It's you comfort that matters! A good night sleep is better and worth the cost.
C. Better solutions $$$:
- Change to gas heater for the shower, if you are using electricity heater.
- Use gas for boiling water instead of electric kettle.
These can save more than switching to LED alone.