Office lighting | Archive Titles

Table 1: Simplified luminance limits
Max brightness above 65°
Screen type	White screen background	Black screen background
Class 1 & 2	1500 cd/m²	1000 cd/m²
Class 3	500 cd/m²	200 cd/m²

Table 2: Cat A luminaire, lighting installation and lighting controls costs
Component	Quantity	Material cost/unit (£)	Installed cost/unit (£)	Total (£)	£/m2 based on net internal area
Semi-recessed 600 mm x 600 mm with dropped aerofoil to open plan areas, inc 3 x 14 W T5 lamps	6580	140	160	1,052,800
As above, with emergency lighting pack	1170	205	230	26,9100
Recessed compact fluorescents, inc 2 x 18 W lamps	1010	60	80	80,800
Extra for dimming ballasts	8760	12	–	105,120
TOTAL LUMINAIRE COST				1,507,820	44.35
Cable tray c/w supports	1050 m		25	26,250
Armoured cable fixed to tray	2240 m		5	11,200
Armoured cable terminations	280		28	7840
40 A lighting busbar, inc end feeds and suspension brackets	4060 m		28	113,680
LCM tap off and lead	1050		15	15,750
4·5 m lsf flexible final connection to luminaire	8760		8	70,080
Testing and commissioning				7000
TOTAL LIGHTING INSTALLATION COST				251, 800	7.41
Area control units	28	800	900	25,200
Lighting control modules including plug-in base	1050	150	175	183,750
Bus cable to lighting control modules	10,810 m	0·2	1	10,810
Presence detectors including sensor lead to lighting control modules	28	50	65	1820
Multi-detector including sensor lead to lighting control module	56	65	80	4480
Support services and commissioning based on factory presets				20,000
TOTAL CONTROLS COST FOR CAT A				246,060	7.24
TOTAL COST, TO CAT A					59.00
Exclusions applying to Tables 2: builders work in connection; professional and prescribed fees; main contractor preliminaries and attendances; contingencies and design reserve; inflation beyond fourth quarter 2004; tax allowances; vat.