Which statement is true regarding IPL therapy?

The statement indicating that longer wavelengths affect depth of penetration is accurate because in Intense Pulsed Light (IPL) therapy, different wavelengths penetrate the skin to varying depths. Longer wavelengths are typically capable of reaching deeper layers of the skin, making them suitable for treating deeper vascular lesions and hair follicles.

In contrast, shorter wavelengths tend to have less penetration depth and are more effective on superficial skin issues. This understanding is critical for practitioners using IPL, as it helps them tailor their treatment plans based on the specific conditions being addressed and the skin types of their patients, optimizing safety and efficacy.

The other statements misrepresent aspects of IPL therapy. While it is true that IPL can be used on a range of skin types, it is not universally safe for all without caution due to varying melanin concentrations that can influence reactions to the treatment. The effectiveness of IPL is also related to the energy levels used; using low energy often diminishes the treatment's effectiveness. Thus, the understanding of how wavelength impacts depth significantly informs both treatment choices and safety protocols in IPL therapy.