firstname.lastname@example.org • www.excelitas.com
When your innovation demands precise color mixing,
high CRI, specifc CCT, exceptional uniformity, or
seamless fber coupling, Excelitas understands your
challenges and has the expertise to deliver an LED
solution driven by your specifcations.
•;COMPREHENSIVE DESIGN - Optical, Thermal,
Mechanical, Industrial and Electrical
•;APPLICATION EXPERTISE - Endoscopy,
Arthroscopy, Surgical Lighting, Headlamps,
Phototherapy and Medical Instrumentation
•;END-TO-END PARTNER - Concept > Design >
Prototyping > Engineering > Validation >
Medical Device Manufacturing
Engage Excelitas to optimize your design, maximize
performance and accelerate your time to market.
Leverage LED Innovation
for Your Most Critical
The Need-to-Know on LEDs
Mark Gaston, SSL product manager at Excelitas, said
any conversation about lighting is going to start with a
crash course in LEDs. These computer chips emit energy
in the form of light, which is sourced from electricity.
While LED manufacturers have the ability to
manufacture high color rendering index (CRI) LEDs,
which offer improved color performance, not all
manufacturers have adopted the technology due
to increased design complexity and affordability,
according to Gaston. During the purchasing process,
certain industry terms are used to describe the light
LEDs provide. Here’s the breakdown.
• Lux: Measurement of brightness. One lux is the
equivalent of one lumen per square meter. For some
perspective, sunlight ranges from 32,000 to 100,000
lux, and a normal office light is about 400 lux. The
brightest surgical headlamps on the market are
about 200,000 lux. When measuring lux, distance is
a critical value, and most headlamps are measured
at 14 inches. Overhead surgical lights are typically
evaluated a few feet out.
• Kelvins: Measurement of color temperature. The goal
for manufacturers is to create an LED as pure white
as possible. Some of the purest white headlamps
are about 6,000 degrees Kelvins, which created a
temporary problem for surgeons. Surgeons said light
cast by headlamp LEDs was too pure and did not
offer the tint fiber optic bulbs had when they got hot.
The xenon bulbs tinged everything a cooler blue and
halogen bulbs made everything look a warmer yellow.
Suppliers fixed this problem with filters.
• CRI: Evaluation of the color purity. Different color
LEDs can be combined to achieve a higher overall
CRI, but that typically means more cost.
(Courtesy of Excelitas)
Surgical lamp modules, like this one developed by Excelitas
Technologies, are used by surgical lighting manufactures to
leverage the benefits of LED innovation.