1. General Information
The majority of data video projectors serve the same purpose. They allow the user to project
from a source (computer, video, DVD player, camcorder etc) onto a large screen.
Most projectors will allow for both video and data to be connected at the same time (although
only one to be viewed unless the system has PiP (Picture in Picture) capability. Increasingly,
more systems will allow for multiple input connections.
Most current projectors will also allow the user the ability to remotely control their computer via
the projector's remote handset whilst some others have wireless and network capability.
2. Choosing Your Projector
Most systems offer the same basic functionality - connection to PC and video systems, in
some cases multiple connections are available, along with remote control facility and remote
mouse control of the computer. Some offer additional functionality such as network and / or
wireless capability, built in visualiser / document cameras and PC free presentations.
However, the following features should always be considered:
a. Resolution:
It is best to match the resolution of your projector to that of your computer. This is
normally measured as the number of pixels across the screen area. The higher the
number, the smaller the pixel size and the better quality of image.
i. SVGA: 800 x 600 pixels
Good for standard use / PowerPoint etc
With advent of computers with XGA as standard resolution, these are becoming less
popular
ii. XGA: 1024 x 768 pixels
For greater detail - spreadsheets etc
Becoming the standard requirement for education
iii. SXGA: 1200 x 1024 pixels
A must for large screens such as theatres / halls etc where pixels are 'blown up' in
size
Becoming important where fine detail is required - architects drawings etc
b. Brightness
This is measured in ANSI Lumens. The higher the lumens, the brighter the ambient
conditions one can project in. Remember, bright sunlight onto a screen will affect the
picture quality and increasing the lumens may not be the answer. Typical school
classrooms require between 1400 - 2000 ANSI Lumens.
c. Lamp Life
This can be a contentious area with many manufacturers claiming long lamp life for their
products, the average for most being approximately 2000 hours. However, this is one area
that cannot be guaranteed with lamps failing after on a few hundred hours of use. The most
expensive single item, replacements lamps averaging between £ 250 to £ 400, their life
can be prolonged with careful use, properly switching projectors off after cool-down periods
and cleaning filters to avoid overheating.
Note that many projectors now come with either a spare lamp or lamp warranty for up to 3
years.
d. Weight
Projectors vary greatly in weight and size with Micro- portable systems now available
under 1kg. However, do bear in mind that functionality will differ according to size - the
smaller the system, the more limiting the zoom and focal length. The heavier and brighter,
the greater the carriage problems. Price will also vary greatly.
e. Security
Some manufacturers have brought out some new Security Projectors with innovative
designs to try and reduce theft problems from education establishments. These are
coloured bright orange (available only to education) and have design features such as
removable control panels, code activation which is set if power is cut etc. There are a
number of non- orange systems available for business and commercial use as well.
f. Short Throw
There are a few projectors offering extreme Short Throw capability. These are used is
situations where the rooms does not allow for a long throw projector to get a decent
screen size. Additionally, it helps to minimise shadowing on the screen when used for
example with interactive whiteboards. Floor, desk or wall mounted on a short boom arm,
there are currently only a few to choose from, however more manufacturers are beginning
to develop these systems.
For further information or to discuss your specific requirements, please call our main office on
01952 677144 and ask for the Projector Helpdesk.
.
