IEC/TR 62778:2012 provides clarification and guidance for the assessment of blue light hazard of all lighting products that have the main emission in the visible spectrum (380 nm to 780 nm). By optical and spectral calculations, it is shown what the photobiological safety measurements relate about the product and, if this product is intended to be a component in a higher level lighting product, how this information can be transferred from the component product (the LED package, the LED module, or the lamp) to the higher level lighting product (the luminaire).