Table 1: Matrix showing specification for experimental conditions
Designers' lighting quality, DLQ Lighting power density, LPD
1 (low)
Recessed troffer with K12 prismatic lens		 1 (low)
electronic ballast
1'x4' fixture with 1 T8 lamp (x 20)
  • angle-arm task lamps (x6)
  • undershelf task lamp (x6)
 2 (medium)
electronic ballast
1'x4' fixture with 2 T8 lamps (x 20)		 3 (high)
magnetic ballast
1'x4' fixture with 2 T12 lamps (x 20)
2 (medium)
Recessed troffer with parabolic louver		 electronic ballast
8'x4' fixture with 1 T8 lamp (x 20)
  • angle-arm task lamps (x6)
  • undershelf task lamp (x6)
 electronic ballast
1'x4' fixture with 2 T8 lamps (x 20)		 magnetic ballast
1'x4' fixture with 2 T12 lamps (x 25)
3 (high)
Indirect or direct/indirect		 electronic ballast
4'-long fixture with 2 T8 lamps (x 8)
(Furniture-mounted indirect)
  • angle-arm task lamps (x6)
  • undershelf task lamp (x6)
 electronic ballast
36'-long fixture with 16 4' T8 lamps (x 2)
(18'-suspended direct/indirect)		 magnetic ballast
36'-long fixture with 16 4' T8 lamps (x 3)
(12'-suspended indirect)