Prismatic Glass

Holophane’s history lies in it being the first company to give practical application to the principles of the prism as the ultimate means of light control, harnessing and redirecting the output of light source by prismatic means to provide the best in cost effective, efficient lighting.

Over 125 years ago Holophane sold the first patented light diffusing globe using borosilicate glass.Today these principles remain core to Holophane’s products and technologies, culminating in our PrismaLED technology.


Glass Refractors

With all of the materials available today (plastics, acrylics, polycarbonate), Holophane has chosen to focus its intellectual energy on glass for one simple reason… the benefit to you, the customer. Glass is actually a very difficult material to work with in manufacturing, but we have chosen to invest heavily in this technology because it has great economic advantages in application. Here are just a few of these advantages…

Glass shows very low thermal expansion or contraction

Sunlight and lamp energy don't affect it. No change with prolonged exposure to sunlight or lamp.

Doesn't degrade over time!

Typical fixture temperatures are comfortably within the melting point of glass.

Remember the test tubes in chemistry class? Making glass ideal for industrial environments and aggressive atmospheres.

Glass does not build an electrostatic charge unlike metals and plastics.

Made from recyclable glass.

Thermal  management

The thermal management of luminaires and the design around this is critical to ensure heat is dissipated away from sensitive electronic components.

By doing so means that we can create a luminaire with market leading light output whilst achieving maximum product life. Complete ‘through ventilation’ of driver electronics chamber ensures minimal dust build up to also aid in the longevity of luminaires.

This is why Holophane strives to design luminaires with best-in-class thermal management and we achieve this by utilising three heat transfer principles: Conduction, Convection and Radiation.


From air movement and flow between the LED module and gear housing of the luminaire


Heat energy from the driver and LED is emitted from the casting in all directions


From the LEDs and driver onto the LED module and gear housing respectively