IWB maximum lumens??

[Jamman960]

Hi all,

 

I've just been shopping around for a matt whiteboard to use with an interactive projector I'm looking at purchasing. I'm planning to go for the Epson 595wi with Touch + pen interactivity.

 

while looking around I came across the following: "It is an accepted industry practice that you cannot go too far over 2,000 lumens on an Interactive Whiteboard surface (which is what is used for this board), otherwise users might get eye damage from the light bouncing back." https://www.jp-uk.co.uk/interactive-whiteboards/projection-whiteboards/sapphire-av/sapphire-harmony-spb2400-94-16-10-2400-x-1200mm-projection-whiteboard.html

 

This is the first time I've come across this and hadn't really thought about eye damage from an image being too bright. The 595wi is 3300 lumens which way over the top but is the only one with finger and pen interactivity so far that I can see. With it being a Ultra Short Throw projector the image is likely to be well over 2000lm although eco mode might help.

 

Has anyone else come across this 2000 lumens guidance?

[3s-gtech]

It does make some sense, though not heard it before. I wouldn't worry about the projector's output though - if in doubt, run it in Eco mode (plus the lamp will last much longer and use less juice).

[OxfordBlue]

looks like a reference back to the BECTA days. Most projectors can be reduced in steps of brightness, or better still built in reactive eco settings. choose what's best for the classroom with lights on, no centre hot spot, and so the teacher's not looking into the projector's mirror.

 

the new touchscreens are much brighter, and more direct close-up light than any projector can output.

[localzuk]

The maximum for a classroom that I was told about was 2500 lumens, with 2000 recommended. That said, as @OxfordBlue says, you can turn projectors into low energy versions.

[Jamman960]

Thanks guys, I probably will just go with it and stick it in Eco mode. I'd never heard anything like this other than advice to stick around the 2000lm area to ensure the board can be seen without needing blinds or lights out

 

our normal projectors are 2300lm which seems about right.

[Sagima]

I vaguely recall a becta guidance of about 1800 lumens. never paid any attention to it though. We have 2600-3300 lumen projectors here any less and the staff whinge about lights and blinds

[MbroTech]

I am sure I remember a BECTA document that specifically mentioned lumens as stated above, but all I can find on the archive is this advice: [ARCHIVED CONTENT] Becta Schools - Leadership and management - Health and safety - Projector health and safety issues