Ok besides debating whether LEDs save money or not let's maybe focus on some real ways of cutting back that power bill. I'll suggest a few things that don't have huge upfront costs.
- Reduce light schedule, simply cut back lighting duty cycle to a minimum.
- Use DC controllable power-heads or alternate AC power-heads provided they can handle the cycling. Alternating pumps can essentially result in half the power compared to always on.
- Reduce flow at night, common practice for many to reduce tank flow at night. Whether it's actually simulating natural effects or not it does reduce power tremendously. For example closed loop pumps or power-heads could shut it off completely at night, DC power-heads could be dialed down.
- Those of us who do use a fair bit of power heating our tanks could use acrylic sumps for better insulation or work on insulating our tanks/sumps to hold heat better.