Spot temperature sensor,
a close range LED display, detecting temperature change at the sensor rather than in an expanding - sensing area of a laser type sensor

Frequency driven, UV & Infrared light transmitter and light sensor,
detecting any reflected light and distortion in said light that was caused by localized absorption or displacement, changing reactions are monitored as sound in real time.

Frequency driven laser light
Theory - two 'Cone' shape projected laser beams at low frequency, possibly in the infrasound range could at a point of convergence cause light nodes, amplified light creating a new vibration light system. Several frequency ranges will be tested.

After re-reading about the Spiricom spirit/EVP communication system developed by George Meek, I have several new experimental systems based on the Spiricom.
These include an optical multi frequency transceiver and experimental EM multi coil transceiver.

Hybrid EMF disturbance and EVP detector
A self generating, interacting multi EM field generator and energy change detector.
Two interacting Electro-magnetic fields tested at various frequencies will cause an audio -intermediate signal when close together.
Any energy change (EM or otherwise) within the vicinity of the coils will cause a changing audio response. If positioned close to the main structural wall of a building, it would constitute an experiment in the stone tape theory.

Light to sound experiments
Frequency driven Red, Green and Blue LED lighting and optical sensor, converting detected or changing light into sound
Projecting light, modulated by sound
There is also a single frequency, phase variable version planned.
The above projects could potentially produce a 3D light wave.
A new Paranormal lighting and sensing system.