A photo-bio-stimulation device uses near infrared (NIR) laser illumination of the scalp to promote hair growth with a lightweight user wearable device. All the remaining components are mounted on the concave underside of an outer cap shell. Many VCSEL laser device chips are surface mount soldered underneath of a single large flexible printed circuit. These discrete devices direct a diffused, near uniform flood of 678-nanometer monochromatic laser light deep into the hair roots and follicles across the scalps of its users. Petal shapes along a central spine are cut deep into the side edges of the flexible printed circuit to allow it to be conformed and fixed into a hemispherical dome and attached with dozens of plastic snaps inside the outer shell. This connects inside to a rechargeable battery and power controller. A protective clear covering matching the concave underside is attached along the brims.