But Were Afraid to Ask
So the big event is tomorrow and you
just find out your client neglected to mention they need an LCD
projector to display there PowerPoint slide shows. You think, "this
should not be that hard." You call a few local AV companies and are
bombarded with questions by the AV rep who appears to be talking in
tongues; From Lumens, Resolutions, Aspect Ratios to Throw Distance and
Front or Rear Projection. Now that this AV guy has you feeling less than
intelligent you try not to sound too defensive and say, "just bring me a
regular projector." When the "regular" projector arrives and your
client arrives also, with his Mac laptop you discover the Mac needs an
adapter and the PowerPoint has high definition videos that look horrible
through the "regular" projector. If this world is still a bit of a
mystery let's venture into the ins and outs of projectors.
Lumens: The Fancy, Glorified Word for Brightness
Note: Movie theaters, while almost completely dark, use between 15,000 and 30,000 Lumen projectors.
One
of the most important aspects of a projector is its brightness. The
brightness of a projector is determined by the amount of Lumens the
projector's lamp produces. Simply put, the higher the amount of Lumens
the brighter the projector. Early on In the AV rental business I was
taught when buying projectors buy the highest Lumen projectors, or
brightest you can afford. In other words, you can always substitute a
lower Lumen projector with a higher Lumen projector but not the other
way around. On the lower end of the spectrum are projectors rated
between 1000-2500 Lumens. In a completely dark room or a room totally
absent of light, a 1000 Lumen projector may be sufficient. The issue
then becomes the amount of light your projector will have to battle to
reproduce the image it is being provided from the laptop, DVD Player,
camera, etc. The more light introduced into the space between the
projector and the projection screen means the more Lumens required to
achieve a satisfactory image on screen. The size of the projection
screen is not as important as most would be led to believe until you get
into screens 12 feet wide and larger. Mid sized projectors are
projectors rated between 3500-5000 Lumens. These are satisfactory for
the amount of light within a well lit office conference room or hotel
meeting room. In most cases you will be dimming the room lights slightly
anyway during the actual presentation. Large event projectors are rated
between 7500-10,000 Lumen and are used for bright rooms or rooms with
windows where sunlight may enter. Large event projectors are also used
for bright rooms with larger projection screens, such as 16 feet wide
and larger.
High Definition is in Cahoots with Resolutions and Aspect Ratios
High Definition video is technically any video content recorded at a resolution of 1280 x 720 (WXGA) or higher.
Photo is Standard Definition, Low Resolution 600 x 400
Photo is High Definition 2592 x 1768
Common Resolution Table
Format - - Resolution - - - - Aspect Ratio
SVGA - - - - 800 x 600 - - - - 4:3 (Standard Definition)
XGA - - - - - 1024 x 768 - - - 4:3 (Standard Definition)
WXGA - - - - 1280 x 720 - - - 16:9 (High Definition)
WXGA - - - - 1280 x 800 - - - 16:10 (High Definition)
FHD - - - - - 1920 x 1080 - - - 16:9 (Full High Definition)
WUXGA - - - 1920 x 1200 - - - 16:10 (High Definition)
Room, Space and Throw Distances
In
the event industry you almost never have enough space. You start your
floor-plan mock-up; drop in your tables, chairs, riser and projection
screens but almost never account correctly the space between the
projector and screen. This is where short throw projectors and front or
rear projection come into play. Front projection is placing the
projector in front of the projection screen, with the projector visible
to attendees and rear projection is placing the projector, hidden behind
the screen. Rear projection gives the most professional and clean look
between the two but is not always possible, due to lack of space. For
this reason I recommend, when ordering your AV, request a projector with
a short throw lens. A lens's throw distance is measured by a throw
distance ratio. In this case the lower the number the shorter the throw.
Projectors with interchangeable lenses come standard with a lens about
1.65:1 but can accept lenses with a throw ratio as low as .8:1 (varies
by zoom and manufacturer).

For
example, using a 10ft wide screen, a lens with a 1.65:1 throw ratio
will require 16 feet of space between the projector and screen. On the
other hand, a projector using a .8:1 lens only needs 8 feet between it
and the 10ft wide screen.There are also ultra short throw projectors.
While these projectors can achieve a throw ratio of as low as .48:1 they
often do not have a zoom feature and do not offer interchangeable
lenses.
Tip for Connecting Projectors and Laptops
When
connecting a laptop to an LCD projector for an event, movie night or any
occasion, for best results and to avoid any failure in communication
between the two devices follow these simple rules.
- Always power up the projector first.
- Connect all cables before powering up the laptop.
- Laptop should be off, not sleep.
- 90% of the time, as the laptop boots up it will automatically connect to the projector.
- When
presentation has ended power off the projector but let the internal fan
run about 5 minutes before unplugging, to cool the lamp.
If you enjoyed the post, please leave a comment and let me know!
Bruce Johnson
A.V. Rental Services, Inc.
4039 Comly Street
Philadelphia, PA 19135
PH: 800-695-5943
FX: 215-904-8503