Higher efficiency options can be considered for high bay lighting.

Why?
Banks of high-output T5 fluorescent lamps are increasingly seen as best practice replacements for high intensity discharge (HID) lamps when fixtures are less than 6–8 m above the floor. This is due to fluorescents’ sustained light output over their lifetime, high colour rendering ability and because they may be more easily dimmed and switched. Another benefit is that failure of a single lamp does not result in the total absence of light in that region.
Care should be taken to ensure that the replacement lamps will have the desired effect, particularly in retail environments. A trial of reflectors in a small area may be beneficial initially.

How?
Approach suppliers and installers of lighting equipment for quotes to replace your existing lighting with fluorescent or LED alternatives.

How did we calculate this?
Replacing 10 x 250W High Pressure Sodium or Metal Halide lights (285W including ballast energy) with 4 x 55W lights saves a total of 650W. Assuming a business runs its lights for 2000 hours per annum (approximately 250 business days X 8.5 hours a day), a total of 1300kWh can be saved, or 1300 x 1.37 = 1,781 kg CO2e.

Cost to implement
$130 per light fitting with lamps supplied. Assuming half an hour install time per light, at a rate of $80 per hour based on an electrician plus hydraulic lift hire at $10 for one hour, the installation cost per light fitting is estimated at $50.