Osram SLIH 200w Linear Sodium Bulb - Looks like a Fluorescent Tube

£63.77 from £57.71

Specification

Part Number	SLIH200-OS
Category	Discharge Lamps
Type	Double Ended no Leads
Cap [?]	G13
Volts	This item is run by control gear in the fitting
Watts	200w
Finish/Colour [?]	Yellow Sodium
Life	6000 hours
Length	900mm
Diameter	38mm
Manufacturer	Osram
Beam Angle [?]	N/A
EAN	635635598723

Description

Following on from AEI's innovative development of the Linear Sodium lamp, it didn't take long before competitors GEC also commenced production of an equivalent range. GEC technology offered a further enhancement to the luminous efficacy of this lamp design by replacing the glass heat insulation sleeves with an advanced 50 nanometre thick film of pure gold, sputtered onto the inside of the outer jacket. 1700 Kelvin and CRI 44 giving 2750000 Lumen output (137 Lumens per watt). Life time 6000 hours to 70% survival. Although costly, this raised lamp efficacy by almost 10% because a thin film of gold reflects infrared radiation back onto the discharge tube far more effectively than a glass sleeve. Absorption of the yellow sodium light is greater than for glass, but the gain in efficacy offsets this loss. Film thickness had to be critically controlled to give the optimum compromise between thermal insulation and light loss. The GEC Golden Linear lamps were offered in two wattages. The company entered the SLI market with a new small lamp, the 60-watt size shown here. A 160-watt model soon followed which had an advantage over AEI's 200W model in that it was compatible with existing 180W SOX ballasts. Launched in 1961, the "Golden Linear" enjoyed great success until 1966, when it was superseded by still more efficient lamps employing heat reflection films of semiconductor materials and a further advance in the discharge tube design was made. This particular lamp here makes use of an experimental discharge tube having very short indents. Although made by GEC, the discharge tube was based on the German Osram design. That company was active in SLI lamp production for only a very brief period. Only available whilst stocks last.

Brand: Osram

Manufacturer Part Number: SLIH200, 200SLIH