An ignitor generally needed start
the lamp. The light
therefore has yellow hue and only
suitable for specific applications.94
The Lighting Handbook
High-pressure sodium discharge lamps
–
High luminous efficiency and long
service life
– Satisfactory poor colour rendering
– Yellowish light colour
– Can dimmed steps
–
Use: industrial bays, street lighting,
outdoor illumination
Colour-improved (Philips SDW):
– Warm, white light
– Excellent colour rendering
– Use: retail areas
Functional description
Discharge the elongated ceramic discharge
tube determined sodium. The current must limited a
ballast.
HST-DE
HST-CRI HST
The most important light sources
HSE
.
Philips colour-improved SDW produces very
good quality white light and popular
choice for lighting retail spaces
