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Used for: More than a year
A full school year in a busy room without a fault
The mirror wants a dust every term
On at 8 in the morning, off at 4, five days a week, and it has not so much as flickered at us. The dusting is a two minute job with a soft cloth.
Used for: 6–12 months
Ours is on a wall arm above a 90 inch board with the cable chased into the plaster. Worth doing properly: with the lead hidden there is nothing to trip over and nothing for a class to pull at. Image quality at that angle is the real test and it holds up. Text along the top of the board is as sharp as text along the bottom, which was never true of the last one we had, and the geometry tools dealt with the skew from the arm in ten minutes. Eight months on it has not drifted a hair.
Used for: More than a year
Long term note from a boardroom that uses this most days of the week. Reliability has been total: no lamp, no filter warnings, nothing beyond a wipe of the front glass when somebody's coffee gets enthusiastic. What I would think harder about is where the sound goes. There is a speaker in it, and it is fine for a video clip with a handful of people in the room, but the moment anyone dials in you want audio going out to the room system, and that socket is easy to forget while the cable run is being planned. The other thing is the geometry. Somebody knocked the arm during a redecoration and putting the image back square was twenty minutes with the corner adjustment rather than the five seconds I had hoped for. Small grumbles about something that has otherwise been faultless.
Used for: Less than a month
Bright enough to leave the classroom lights on
The wall arm is a job for two people
The whole point of choosing this over something cheaper was teaching with the lights up, and it delivers: the back row can read a spreadsheet at normal room brightness with the blinds open. Getting the arm level took two of us and a very long spirit level!
Used for: 3–6 months
Sits close enough to the wall to be invisible
You lose a little light on a matt painted wall
Around 45cm off the plaster and it throws a picture the full width of the room. Presenters have stopped squinting into a lens, which was the entire point of the exercise!
Used for: 1–3 months
No shadow on the board when you stand in front of it
The wall has to be flatter than you would think
Replaced a long throw unit above the seats that everybody walked through the beam of, and this sits inches from the board so nobody gets dazzled and nobody casts a shadow. Focus across a 100 inch width is good but not perfect: our wall has a slight bow near the skirting and the bottom corner softens where the plaster does. On a proper board it would be fine. Six weeks in, no other complaints at all.
Used for: 1–3 months
Ultra short throw is unforgiving of an imperfect wall
The middle rating is because the projector is doing its job and the room is not, and it took a while to work out which was which. Ultra short throw means the light hits the wall at a very shallow angle, so whatever the plaster is doing gets magnified: a shallow ripple across the middle of ours shows as a band of soft focus, and no amount of time in the focus menu touches it. The second thing is the hotspot. On a gloss whiteboard the bottom third of the image throws a bright reflection straight back at the front two rows. A matt board or a proper ultra short throw screen cures it, but that is another line on the order which nobody warns you about. Brightness and colour are excellent, it starts instantly and the fan is no louder than the unit it replaced. Seven weeks in I would still choose it, with the wall sorted out first.
Used for: More than a year
No lamps to buy, which was the whole business case
Fan noise sits under everything in a quiet room
Solid workhorse, though in a small meeting room you do notice the hum during a pause in conversation