Design Tips

Common Issues (to avoid)

Mixing Products with different CCT & CRI:

  • This creates issues with colour and colour rendering, ie; products change colour when a customer removes it from the display case. Pick a colour, and stick with it.

  • Typical CCT – Homes: 3000K, Offices: 4000K, Retail: 3000K or 4000K, Discount Stores and Warehouses: 5000K, Carparks 5000K


  • Unnecessary illumination increases energy consumption.

  • Don’t illuminate all areas to the maximum illumination required. A jeweller may require 1600 lux for fine work, but this is only required at a small part of the workbench. Similarly, office workers require 320-400 lux for reading documents, but this is only required at their desks. The general lighting can be 120-160 lux, and 320-400 lux can be reached with desk ligthting.

  • Excessive Ambient Illumination levels necessitate higher Accent illumination levels.

  • Increased illuminaton levels have a logarithmically decaying rate of return. ie; from 125 to 250 lux is a significant difference, from 250 to 500 lux is a noticeable difference, but 500 to 1000 lux is significantly less dramatic.


  • Downlight luminaire with Beam Angles exceeding 80degrees, have increased visibility from longer ranges (further away).

    • In large rooms with multiple light fittings with wide beam angles, multiple luminare are within the occupants field of view, the lighting can cause irritation.

    • Luminaire with bright illumination surfaces and wide beam angles can cause annoying reflections on computer, phone and tablet screens.

    • SMD luminaire with clear dffusers can create multiple glare angles, and can reflect off glass rims, causing glare issues.

SMD lighting

  • SMD luminaire consist of multiple individual LEDs with slightly differing properties at the time of manufacturing. Without sufficient range between objects and the SMD light fitting, the result can be multiple differently coloured shadows.

  • CCT can vary significantly between different SMD LEDs inside the fitting, and the CCT can vary widely between two light fittings in the same batch.

  • LEDs also change CCT (colour) slightly as they age. The many different LEDs in an SMD LED fitting can colour shift in different directions, and entirely different fittings may appear very different colours after as little time as 6 months (600 hours) after installation.