Projector tech

Real buyer questions on projector tech, answered in plain terms.

I see brief rainbow flashes on my projector, especially on white text. What is that?

That is the rainbow effect, a known characteristic of single-chip DLP projectors, and it is not a fault with your unit. It is how the technology draws colour.

Projector tech
There's a small dark blob or coloured spot in my projected image that moves with the picture. What is it?

First localise it: pause on a plain white image, then look at what the artefact does. That one test tells you which of three things you have.

Projector tech
My projector's fan has become loud. Is something wrong?

A projector that has grown louder is telling you about heat, and the message is usually about the filter rather than the fan.

Projector tech
How long will my projector's lamp or laser actually last, and how do I make it last longer?

Manufacturers publish rated hours per model and per picture mode, and that is the reference: check the official spec page for your projector rather than any figure I could give you here. Real life then varies with how you use it and where it lives, and that part is under your control.

Projector tech
My projector image is sharp in the centre but soft at the edges (or sharp on one side only). Why?

Three causes, and I check them in this order: geometry, focus uniformity, installation drift.

Projector tech

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