PTC STEM

I had several people ask about how the IR-SENSE film works with smartphones. This video by @RogerSeheult offers a great summary and a direct link for the discounted @medcram price. youtube.com/watch?v=PLJrvn…

Yes, an incandescent bulb produces near infrared (NIR) light. However, most of the electricity powering an incandescent light goes into heating the glass and air around it. This makes an incandescent bulb a fire and skin burn hazard.

NIR enhanced LED bulbs can provide more infrared between 650-950nm (biologically active region) compared to an incandescent bulb running at the same wattage. They do so without overheating the bulb and fixture. NIR enhanced LED bulbs also produce more visible light per watt of electricity.

Narrow-band visible-only LEDs can be transformed using the IR-CAP photonic technology. It converts ~50% of visible LED light into full spectrum with invisible NIR. The following video explains how :

Fall leaf transition from active growth (photosynthesis) to decomposition, captured in both visible light and infrared.

Healthy leaves have a well-organized internal structure, especially in the spongy mesophyll layer, which contains many air spaces. These air–cell wall interfaces scatter and reflect near-infrared light (NIR) more efficiently.

Unhealthy leaves reflect far less NIR light primarily because of changes in their internal structure including loss of chlorophyll and water content.

Satellites can detect vegetation health by analyzing the difference between how much NIR light and red light plants reflect.

Trees are changing colors. Visible wavelengths only. Near infrared ones remain strong, even on a rainy day.