Overhead projectors use a bright lamp and mirrors to display text or images from a transparency sheet on a wall or screen. If your projector displays a shadow when projecting, you must troubleshoot ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. We have recently taken a look at some of the older and the newer ways television pictures are ...

If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. If you’ve got a child who’s afraid of the dark, or baby ...

Philips believes that its compact, high brightness and efficient Ujoy lamp meets the stringent requirements placed on light sources for personal projectors. Pavel Pekarski tells OLE why the lamp is ...