Design
Lighting
The usual lighting at exhibitions is either overhead tungsten or fluorescent lights. Generally speaking this is sufficient for most purposes, unless you want to highlight a particular part of your exhibit, in which case you need spotlights. These are easily obtainable from any electrical shop (wattages of 100/150 are probably the most useful), but do remember that the exhibition organisers need to know that you need an electrical supply to the stand, and that it may cost you extra.
Many modular systems offer spotlights styled especially for their units.
Remember that most shell schemes have a muslin ceiling which is intended to diffuse the light. It certainly does this, but it also cuts its intensity, often severely, so extra lighting is usually essential to avoid having a dark and dingy stand.
Remember properly used lighting can do a great deal to enhance an effective display. However it is a double-edged sword because it could emphasise faults in a poor display.
If the room is lit by daylight, careful planning is necessary. Avoid putting spectators where they are viewing the exhibit against a glare from windows. Also avoid casting shadows on the exhibits.