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Chris took us back in IFA History with early TVs and mishaps:
In 1935, At the 12th “Big German Radio Show” or IFA as it is named today, the public for the first time had the chance to compare TV sets: in a dedicated “television street” six companies presented no less than 20 different models. Two stations made live broadcasts in UHF from the showfloor. But the hall caught fire and transmitters as well as the TV sets, many of them still prototypes, were burned to ashes.
Jack in Guam listens on KGUM asked:
As a teacher, I’d like to find out: What multimedia projector would be best to use in the classroom without having to turn off the lights?
You’ll want to look at projects with the most lumens you can afford.
3000 lumens should be enough to give you a readable image, but the image will be a little washed out with the lights on. More lumens will increase the price along with readability, however.
Now if you’re happy with turning off some lights or with having an picture that will be a little less clear, you could get a ViewSonic PJD5155 for about $300, or an Optoma S316 for the same price.
If you want to try for something a little less expensive, you could go down to the 2000-3000 lumen range and pick up a projector for around $200, but be ready to turn off the lights if you need to.