Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
It has enough light power. Focus adjustment is working fine. Fits to my head and it's not uncomfortable to wear.
If I use high quality (low inner resistance) AA alkaline cells, the driver electronic in the lamp starts to smoke after 30 seconds. I didn't try what happens if I keep it switched on. I recommend to USE IT WITH RECHARGEABLE BATTERY ONLY! NiMH and NiCd has 0.3V lower nominal voltage which leads to 1.7W total power dissipation instead of 2.4W (according to my measurements). From the other point of view the LED has not enough cooling so NiMH is advised again. (Inside the lamp head there is a 1mm gap between the LED holder and the external heat sink, which makes it impossible the transfer the heat properly.)
For this money the built quality is satisfying.
If the driver electronic survives, the lamp might be used for long time.
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