architecture - engineering - construction
Alkco Lighting
ST Series - Supplemental Surgical Lighting
ST Series - Supplemental Surgical Lighting - Page 1
ST Series - Supplemental Surgical Lighting
ALKCO
ST
Series Supplemental Surgical Lighting
Recent focus groups with operating room staff and maintenance personnel confirmed that
while medical technology has advanced, requirements for ambient lighting in the surgery
remain as demanding today as twenty years earlier, The ST Series incorporates improved
features and lower manufacturing costs to offer a task-specific design that meets these
unique requirements and complies with the realities of today’s tighter health care
construction budgets.
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| Asymmetric/Symmetric light Distribution
6 lamps combine with a proprietary, Iow-brightness asymmetric/symmetric V-lens to provide
required comfortable high levels of illumination. The asymmetric component biases higher
footcandles onto the surgical task to balance contrast between brightly illuminated
surgical field and surrounding task area. The symmetric component fills in room ambient.
ST fixtures are often furnished to allow switching of lamps in pairs such that three
different light levels can be created, while maintaining asymmetric/symmetric
distribution.
Low Profile Housing
Plenum space in a surgical suite is always at a premium. 2x4 and 2x2 ST luminaires have
shallow 4½" profiles to minimize the possibility of plenum interference. The dual
wireway format allows integration of up to 3 suppressors and 2 lamp battery back-up while
maintaining the 4½" profile. The dual wireway also results in cooler operating
temperatures and longer ballast service life. Standard ST housings are fabricated from
pre-finished aluminum for ease of installation and maximum heat dissipation. An optional
20 gauge steel housing, powder-coated after fabrication, may be specified.
Control of Radiated EMI
Radiated electromagnetic interference (RFI) originates from the electric arc which runs
through a fluorescent lamp. Lenses on all ST luminaires have a Silver-X™ metallic and
which is mechanically grounded to the housing. This system restricts the radiated EMI
within the military standard 461 C&D test limits. Compliance can be only accomplished
with magnetic ballasts, standard on ST fixtures. (Shielding radiated EMI with lamps run by
high frequency electronic ballasts is not possible.)
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The essence of true surgery teamed supplemental lighting.
A Mil-spec radio suppressors eliminate conducted
EMI to prevent interference with other equipment B on the same power
supply circuit. Silver grid screened on the lens C eliminates radiated
EMI that can also disrupt sensitive equipment. 6 lamps and low-brightness asymmetric lens C
directs 200-300 foot candles onto the surgical table D to reduce
fatiguing contrast from intense major surgical light (not shown), while providing ample
general room illumination E. |
