Leading you to an educated decision.
ASHRAE 90.1-1999 Section 188.8.131.52
The 2001 version of ASHRAE 90.1 remains consistent with the requirements of the 1999 version regarding interior lighting power. These include additional power for decorative lighting (1.0 watt per square foot), VDT terminal lighting (0.35 watts per square foot), and retail display lighting. In the latter case, either 1.6 watts per square foot of specific display area is allowed for general merchandise highlighting or 3.9 watts per square foot of specific display area is allowed for valuable merchandise highlighting.