I would appreciate some feedback on making a driver for a headlamp I am planning on (I explore abandoned mines, I want as much light as I can get).
While my current 2x XM-L lamp is good, I want something brighter, and to keep this as a reliable backup. I currently use a TaskLED HipFlex to drive the 2x SM-L T5’s from a 3S2P/3S3P 18650 packs (Balanced on an iMax B6). It is very good, but overkill for what I need. I do like the 5 power levels, and the ability to switch into high and back to the previously set power level. Other than the voltage status LED, that’s all I want really. I plan on driving 4-6 XM-L2’s, or possibly run a pair of bare MP-G2’s with 2XM-L2’s on tight optics (MP-G2’s for walking around, close up photography, XM-L2’s for long-range throw).
I do have some electronics experience, and looking around, most things seem to be based on multiple AMC 7135’s, which strike me as rather inefficient compared to an inductor. That said, I know nothing about inductors, other than a hand-wavey basic overview. If I go down the Linear driver route, is there any reason I would not want to use say 2x 7150 instead of 8x 7135’s? I assume these are happy to have the Vcc pin PWM’d?
Any thoughts/ideas/links/totally different approaches appreciated.