Are PHOS LED projectors silent?

The lower performance classes of our PHOS LED projectors, PHOS 15 – PHOS 25, are passively cooled and therefore absolutely noiseless. For projectors with higher power, PHOS 45 – PHOS 85, a very quiet fan is used.

What colour should the projection surface have?

A projection surface should have a white colour when exact colour reproduction is important. Coloured projection surfaces can also be very attractive when black & white gobos are projected. In any case, light shades are better suited than dark ones to achieve a high-contrast and bright reproduction.

Can I also use slides or transparencies in gobo projectors?

Colour printed transparencies or slides are not suitable for use in Derksen projectors. The carrier material and the colours are not durable and will be destroyed by the energy of the light in a short time. Transparencies or slides even pose a safety risk, as unsuitable material can ignite at a short distance from the light source. Glass gobos can be used without risk and are durable.

Does Derksen also manufacture digital projectors?

No. Derksen Lichttechnik specialises in analogue projection technology and sells its products in more than 36 countries. The special fascination of analog gobo projection lies in its tranquility and simplicity. In our world there is an alarming excess of information and fast visual stimuli.

What affects the visibility of a projection?

The visibility of a projection to the human eye depends on: 1. output power of the projector, 2. brightness of the ambient light, 3. distance, 4. focal length of the lens, 5. colour and condition of the projection surface, 6. colour of the projection motif. For difficult situations, a test setup is required.

What is the difference between PHOS projectors and graphic projectors (GL series)?

The PHOS family is characterized by a compact, closed design. The projectors can be easily integrated into rooms. Graphic projectors from the GL series are larger and offer the possibility of using accessories for moving light effects, e.g. a projection clock or an automatic gobo changer. The most powerful device is the GL 1200, with a 1200 Watt metal halide lamp, for indoor or outdoor use.

How can a distorted image be corrected?

A distorted projection is caused by an oblique angle between the optical axis of the projector and the projection surface. If the projector cannot be aligned at right angles, it is possible to pre-distort the image on the gobo so that the result appears straight. Derksen offers keystone correction as an additional service.

Why do LED lights need cooling?

LEDs (Light Emitting Diodes) consist of semiconductor materials that must not be heated like the filament of an incandescent lamp. The  lifespan and brightness of an LED decrease when the operating temperature exceeds a limit. Efficient cooling therefore guarantees the reliability and brightness of a projector.

How are projection motifs produced?

Derksen manufactures gobos based on digital data from customers. The data is checked and processed for use with a high power laser. The motif is then engraved with extreme precision into specially coated glass. Depending on the number of colours in the motif, this process is repeated up to four times.

Are projections also visible in daylight?

Outdoors, projections are invisible in sunshine or cloudy skies. The sun is an outstanding source of light. Daylight overpowers any artificial light. In an interior with windows, the situation may look different: It must be checked if the power of a gobo projector is sufficient.

What is the lifetime of an LED?

The lifetime of an LED lamp depends on numerous factors, including the operating temperature. An LED loses brightness during its lifetime. In the technical data you will find the L70 value, which indicates after how many hours the brightness of the LED drops below 70 percent of the initial value. Even after this time the projector remains functional.

What’s a gobo?

A gobo is a mask made of metal or glass that is placed in front of a spotlight to project an image. The Gobo carries the projection motif. Derksen manufactures Gobos from specially coated glass with up to 4 colours (CMYK raster). All Gobos are durable and do not fade.