Components | LEDs | UV-LEDs | Special Applications | Jun 24, 2019

Violumas improved output for their UVA 320– 410nm LEDs

Violumas recently announced a 30% increase in optical output for all UVA SMDs. This increase can be attributed to their "Index Match" technology. The standard product line has a default radiant angle of 60°, and custom optics can be fitted for angles of 30°, 60°, 90°, 120°, and flat. Violumas first revealed its surface-mount-device (SMD) product lineup with a focus on thermal dissipation at RadTech 2018 in Chicago, Illinois.

Violumas' unique 3-PAD SMD structure optimizes heat dissipation from chip to heat sink via specialized thermal pillar MCPCB. Violumas SMDs have thermal resistance of 0.9°C/W, which is the lowest on the market. Because Violumas' SMDs exhibit exceptional thermal resistance, they can be driven at higher currents without experiencing dramatic thermal decay. In regular applications, this directly corresponds to increased reliability and life span. But interestingly, Violumas' industry-leading thermal characteristics make their products ideal for high power applications with extreme wattage and cooling requirements, opening up the possibility for new applications and deployments.

Violumas has also updated the form factor of the Mid Power Series by reducing the footprint from 6.0x6.0 mm to 5.2x5.2 mm. The High Power Series increased in size from 7.0x7.0 mm to 7.2x7.2 mm for improved accuracy when placing the lens. The updated specifications are listed below:

Mid Power Series (VS5252C1L6):

Wavelength (nm)    Typ. Optical Output at 700 mA (mW)     Forward Voltage (Vf)
       405                                        1285                                                 3.7
       395                                        1280                                                 3.7
       385                                        1300                                                 3.9
       375                                         930                                                  3.9
       365                                         775                                                  4.1

High Power Series (VS7272C4L6):

Wavelength (nm)    Typ. Optical Output at 700 mA (mW)     Forward Voltage (Vf)
      405                                        4900                                                 7.4
      395                                        4700                                                 7.5
      385                                        4650                                                 7.6
      375                                        3300                                                 7.8
      365                                        2850                                                 8.2

In addition to high performance UV LED packages, Violumas is unique in manufacturing custom SMD and COB modules for 3D printing and epoxy/ink applications that require high wattage and uniformity requirements. Violumas also provides services in thermal management solutions and can offer full-system UV LED integration for unique 3D printing and curing projects.

More information can be found at

About Violumas:

Based in the heart of Silicon Valley, Violumas is a UV LED company that is dedicated to providing full-service UV LED products and solutions. Our patented chip technology allows us to engage in unparalleled applications of ultraviolet technology with more powerful and reliable deep UV solutions. As a company that carries the whole spectrum of UV products from wafers to modules in the UVA to UVC range (405 nm to 265 nm) and capabilities in optical, mechanical, and thermal design, Violumas aims to be the world-leading supplier of high performance UV LED solutions.