Root3’s Guide to Reducing Costs with LED Lighting

Energy costs can be saved by changing the type of lamp or light fitting installed in a property.

Example 1: Office

In an office application the fluorescent tube is the most common lamp in use. Normally twin or quad tube fittings are used in many sizes including the 600mm (2ft) up to 1200mm (4ft) but other lengths can be fitted.

A four tube 600mm x 600mm light fitting will typically consume approximately 80 watts of energy. The tubes are 18 watts each and the control equipment inside the light fitting which regulates the fluorescent gas, consumes approximately 8 watts depending on the make, giving a total of 80w.

Example 1 – Office: 100 x standard fluorescent fittings (quite conservative for a small office). The energy consumed would be 80w x 100 equating to 8000w or 8kw.

Taking an average unit cost per Kw of 12p, that would total £8.64 per day based on a 9 hour day. This would equate to £2,592.00 based on a 6 day week, 50 week year.

The Solution:

100 x 600×600 LED fittings consuming just 25w each, would equate to 2,500w or 2.5kw. Taking the same average unit cost of electricity of 12p per kwh, the daily cost would be £2.70 per day. Therefore over the year, the total cost would be £810.00

That’s a massive saving of £1,782.00 or a 69% energy cost reduction.

Example 2 – Warehouse

A warehouse that currently has 100 x 400w metal halide highbay fittings.

40,000watts or 40kw are being consumed at any one time.

40 kw x 12 hours per day x 7 days per week equals 3,360kw x 12p equals £403.20 per week. This x 51 weeks equals £20,563.20 per year.

The Solution:

100 x LED highbay fittings consuming just 150w each, would equate to 15,000w or 15kw.

15 kw x 12 hours per day x 7 days per week equals 1,260kw x 12p equals £151.20 per week. This x 51 weeks equals £7,711.20 per year.

Another huge saving of £12,852 or a 63% energy cost reduction.