The Combo units (Diesel XL, XL Shortie, Tabletop, Mini) have blue added to each bulb. So each bulb has 3 diode chips: blue (450), red (670), and NIR (810). There’s multiple positive attributes for adding blue light: For skin issues, blue is excellent for acne, psoriasis, eczema. It also increases collagen production, and can kill pathogens on the skin from cuts/scrapes. Blue is excellent for balancing the circadian rhythm and aid in sleep. When used first thing in the morning, blue will reduce melatonin and increase serotonin. It will also benefit those suffering from depression and seasonal affective disorder (SAD), as well as cognitive issues, particularly when pulsed at 40hz. New research is also showing benefits for reducing hair loss and increasing hair strength.

Red and NIR also have many of these benefits, but adding blue can maximize the benefits. However, when blue is added to the bulbs, some power has to be taken away from the red and NIR bulbs, about 15%. That small amount of power can easily be made up by increasing the typical 15 minute session by around 2-3 minutes. The ratio of each bulb is 50% NIR, 25% red, 25% blue, so you’re still getting a dominance of NIR for deeper penetration of light. With the combo, you have mode 1: blue only, mode 2: red/NIR only, mode 3: blue/red/NIR.