![]() ![]() Both levels work until the whole thing shuts down because the batteries are exhausted.Ĭommercial manufacturers could do this, but the circuit is more expensive, and the customer wants CHEAP. At High the batteries will last a shorter time but the light will still stay constant this is suitable for moving fast through the bush. At Low the batteries will last a very long time and the light will NOT vary in brightness it is quite enough inside a tent. Os by Petzl: Why is the ECONOMIC level in constant mode limited to 12.5, 20 or 25 Os by Petzl / NAO: How do I create my own profile What settings can I change for my profile Os by Petzl: Why is the reading threshold changeable Os by Petzl: How do I restore my lamp to the 'factory' settings Which headlamps are available with the BELT. The circuits genuinely regulate the voltage applied across the LED to whatever voltage you want, and in mine I can switch between two levels: High and Low. ![]() The circuit converts the 1.5 V to a regulated 3.6 V. I make my own headlamps using a full-blown switch-mode circuit, and they can use a SINGLE AA battery or TWO AA batteries. (For ‘crude’, read ‘cheap’.) Some lamps just stick a resistor in the circuit to get lower brightness, which is wasteful. One of the problems with many commercial headlamps is that they (more or less) simply put the 3 AA or AAA batteries across the LED and rely on the match in specs to get the ‘high power’ rating. Of the bunch the Petzl e+lite is still a decent lightweight alternative that provide pretty good output for a long time, due to using two lithium button cells. Sorry if this is excessive thread drift but the realization of the sort of advertising quoted above is what turned me off from mainstream headlamps. Nimh or lithium primary batteries will provide a more constant light output, but will drop off more quickly at the end, especially the lithium primary. I did not find any data on what batteries are used, but based on the curve shown on the website it is likely alkaline batteries. Just as a FYI, no set of 3 AAA batteries will deliver enough energy to light a LED at 100 lumens for 120 hours or 200 lumens for 60 hrs.Īccording to Petzl, The measurement is made from when the lamp is turned on until the user cannot move for lack of visibility this value has been estimated to be 0.25 lux at 2 meters (equivalent to a full moon night). 180 hrs at 20 lumens, 120 hours at 100 lumens according to the REI page (replaced by new model 60 hrs at 200 lumens, 240 hours at 5 lumen red I believe) ![]()
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