Yes it does glow visable red, but the value is still great - Armasight IR810 Infrared Illuminator for Night Vision Monoculars

The iPhones camera picks up some infrared light, so the photos provided make the light appear more noticeable. To the human eye it’s about half as bright, maybe less.

However if it’s a very dark night, I think you’d be able to spot the emitter from over 100yds away, but only if you’re looking directly in line with the emitter.

For the price, I’ll be buying multiple of these to have spares. They’re great for training or just mounting on the side of your NODS helmet so you can have a hands free IR illuminator.

I don’t see a spot to add photos on mobile, if I find a way I will try to edit this review.