How do Lamp-Free Projectors Work?

How do Lamp-Free Projectors Work?

Improved clarity, longevity and long-term cost-savings are some of the benefits associated with the modern lamp-free projectors that are dominating the market. However, before investing in one of this seemingly futuristic equipment, it’s important to do some research into how these lamp-free projectors actually work.

Use of projectors

Modern projectors create incredibly large, immersive images that are required for viewing by an audience in auditoriums, classrooms, lecture theatres and cinemas. The image clarity is an important aspect when projecting visuals as people sitting far away will have to be able to view what’s being projected as clearly as those near the front.

How projectors work

Both lamp-free and traditional lamp projectors function essentially in the same way in that something creates light and this light is then manipulated into an image which is projected onto the screen. With traditional projectors, it is a lamp (or lamps) creating the light, whereas lamp-free projectors use a solid-state light-source, specifically LED, LED/laser hybrid, laser phosphor or RGB laser. The light is then processed to create an image using one of three processing styles: LCD (lowest quality), single-chip DLP (better quality) and three-chip DLP (best quality).

Lamp Free Projectors

Lamp-free solid-state light-sources

1. LED projector– although this has been on the market for some time, it has a major advantage of its 30 000-hour lifecycle. Unfortunately, the brightness limitation means it’s only suitable for darkened rooms.

2. LED/laser hybrid projector – these use a combination of LEDs and a laser diode, making them a bit brighter and pricier as well.

3. Laser phosphor projector – these use a single blue laser that shines into a phosphor wheel creating a yellow light. The blue light passes through, and the yellow shines into a colour wheel to create red and green. The improved brightness makes them ideal for corporate, educational and professional use.

4. RGB or direct laser projector – these are extremely bright, using three individual lasers – one each for red, green, and blue.

Projectors use red, green and blue light to create every colour that is viewed on the screen. A traditional projector lamp creates white light, most of which has to be absorbed or blocked so that the red, green and blue parts remain and are projected onto the screen. However, the laser projectors create only the exact colours that are needed, which means less power is wasted.

Lamp-free projectors also achieve enhanced colours – richer, deeper and vaster – than the traditional lamp projectors. This is because they can be constructed to create whatever wavelength of light is required meaning wider colour gamuts are possible without brightness issues.

And, unlike the traditional lamp projectors, lamp-free projectors can turn on and off almost instantly. There is very little waiting time for warming up and cooling down which means a dynamic contrast ratio potential for darker scenes or images.

Read More: 6 Advantages of Lamp Free Projectors 

Laser safety

Because the laser of the projector passes through a phosphor of diffuser wheel, the light from the projection lens complies with necessary safety standards, and there is no risk of retina damage, unless users intentionally stare into the lens directly for prolonged periods.

Energy saving

The latest lamp-free projectors are much ‘greener’ technology because of their energy and cost-saving benefits, as well as materials used.

  • There is no mercury as found in the traditional lamp projectors, making them better for the environment.
  • The lamp-free projector consumes about 50% less electricity than the lamp projector.
  • The dust-resistance saves on future servicing costs.
  • There is no need for lamp replacement which saves on future replacement costs.


There are a range of lamp-free projectors on the market and, while they all have numerous benefits over the traditional lamp projector, it’s important to get professional insights into the quality and ability of each to ensure you’re getting the best lamp-free projector for your use.