If after months of use you see no results, the reason is usually one of six. Most are fixable.
1. Insufficient Power
The most common reason. If the device does not state real power in mW/cm², you cannot know if the dose reaches the therapeutic threshold.
The number of diodes is not an indicator. Two hundred weak diodes give less than one hundred strong ones. Look for measured values.
2. Too Soon for Conclusions
| Goal | First Signs | Mature Result |
|---|---|---|
| Acne | 4–6 weeks | 8–12 weeks |
| Texture and Tone | 4–8 weeks | 3 months |
| Fine Lines | 8–12 weeks | 4–6 months |
| Hair Loss | 6–8 weeks | 6–12 months |
Collagen doesn't build in two weeks. More on this in Anti-aging with Red Light.
3. Irregular Use
Two weeks daily, then nothing for a month — this doesn't work. Photobiomodulation is a cumulative process.
Three sessions a week for six months beat daily sessions for one. See how often.
4. Something is Blocking the Light
Cream, mineral SPF, or makeup during the session can reflect a significant portion of the light. Detailed in LED and Skincare Routine.
Another common oversight: the mask doesn't fit snugly, and there's a gap between the diodes and the skin. Intensity drops with the square of the distance.
5. Wrong Indication
LED does not work for everything. Do not expect results for:
- Deep static wrinkles — other procedures are needed here.
- Cystic acne — requires medical treatment.
- Melasma — see the separate article.
- Dilated capillaries and rosacea.
- Completely bald areas of the scalp.
6. Unrealistic Expectation
LED therapy provides moderate, gradual improvement. It is not a filler, not a laser, and not surgery.
Practical test: a photo under identical lighting every four weeks. The mirror every day doesn't register slow change.
Frequently Asked Questions
When should I give up? If after three months of regular use with adequate power there is no change at all.
Should I increase the time? No. See the biphasic dose-response in how often.
Related Articles
Sources
- Huang YY et al. Dose Response. 2009.
- Avci P et al. Semin Cutan Med Surg. 2013.
This article is for informational purposes only and does not replace medical consultation.
