So you've gone through your office and replaced all your old tubes with the "energy efficient" tri-phosphor tubes. I'm sorry, but this isn't saving you any energy! The tri-phosphor tubes are more energy efficient than the old "halo-phosphor" tubes - but this means while they produce more light - they still use the same amount of power. So if you've put tri-phosphor tubes throughout your office it will be brighter - but won't be using any less power. What you should now do is install reflectors and delamp half those tri-phosphor tubes. This will cut your power bills and slash your greenhouse gas pollution!