EQUIPMENT, TECHNOLOGY, & INNOVATION
Stack Smarter Why Order Matters When Combining Red Light, Heat Therapies, and UV Tanning BY K R I S T I N L E E S M I T H E R S , C LT
Stacking Therapies: Why Order Matters Stacking therapies can be powerful, but order matters because temperature and blood flow affect how light travels through the skin and how cells respond. When we talk about absorption and scattering—how skin soaks up and bends light—cooler skin behaves more predictably. This is why most clients do best with red light first, heat second, and UV last.
Heating the skin changes absorption and scattering when dealing with red and infrared light therapy. More light bounces off and is reflected at the surface, and what does enter is used up in the top layers, which limits or stops delivery to deeper tissues. Simply put, warm skin reduces light traveling to where it needs to go, or blocks it completely. Placing photobiomodulation (PBM) prior to infrared heat, while the skin is calm and product-free or with a product that enhances light, allows photons at 630 to 660 nanometers and around 850 nanometers to reach chromophores— the light-catching parts of the cell— and support ATP and ROS balance (cellular fuel and helpful signaling).
Heat Is a Helper When Placed After PBM Sauna and infrared heat increase vasodilation and perfusion, meaning open vessels and improved blood
PHOTO PROVIDED BY LUNA LIGHTS PHOTOGRAPHY
The Light’s Path: Why Cool Skin Helps
flow. After PBM delivers photons, heat supports comfort and recovery. If you reverse the order, preheating raises surface losses and scattering, which can make PBM less consistent. Keep the thermal load moderate: warm is good, but too hot for too long is not.
UV Last, with Dose Discipline UV results depend on MED (minimal erythema dose), your personal “donot-pass” line for redness. Prior heat can create a visible flush that looks
like color but is not yet melanin. Place UV third, keep minutes at or below plan, and do not add time just because warmth feels good.
What Goes Wrong If You Flip the Stack • Heat before PBM: More surface losses, less predictable red light dose. • UV before PBM and heat: Inflammation and vasodilation occur first, and later heat can
SUN IS LIFE MAGAZINE |
DECEMBER 2025
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