CLT Photobiology & Light Science

Question 1

What is the term for the study of the effects of light on living organisms?

Accepted Answer

Photobiology

Answer

Photobiology is the scientific discipline that examines how light affects living organisms at cellular and systemic levels.

Question 2

Which part of the electromagnetic spectrum is used in most light therapy applications?

Accepted Answer

Visible and near-infrared light

Answer

Visible and near-infrared light (400–1100 nm) are the ranges most commonly used in light therapy due to their safe and therapeutic tissue penetration.

Question 3

What is the Grotthuss-Draper Law in the context of light therapy?

Accepted Answer

Only absorbed light can produce photochemical effects

Answer

The Grotthuss-Draper Law states that only light that is absorbed by a chromophore can initiate a photochemical reaction.

Question 4

Which cellular organelle is considered the primary chromophore for red and near-infrared light therapy?

Accepted Answer

Cytochrome c oxidase in mitochondria

Answer

Cytochrome c oxidase, located in the mitochondrial inner membrane, is the main chromophore that absorbs red and near-infrared light to enhance ATP production.

Question 5

What does the term 'fluence' refer to in light therapy dosimetry?

Accepted Answer

Total energy delivered per unit area (J/cm²)

Answer

Fluence, measured in joules per square centimeter (J/cm²), represents the total radiant energy delivered to a surface area during a treatment.

CLT - Certified Light Therapist Practice Test

CLT - Certified Light Therapist Practice Test

CLT Photobiology & Light Science