I was recently considering a Spark SD6 until I saw how bulky they are om the forehead. Love my ZL502 and H51 NT which is out for repair after 2 years of hard daily use. I bought the H502 for a spare while the H51 makes its round trip to china. Fell in love with the wide smooth floody beam for table work, reading, or working in a confind area. Definitley not a thrower but for digging in a pack or a tent light it's aces.
I too opted to get the Fenix headstrap for my PD32UE which is an amazingly nice combo of throw and flood. I'll strap the PD32 on my head if I should need big lumes out there and hands free, but honestly I havnt been in a situation yet where my H51 wih a fresh AA hasnt been able to handle. Both are great lights. The Fenix headstrap will give me the option to go nuclear if needed.
The no warning cutoff and the reported memory problems with the Sparks were a dealbreaker also.
If ZL would put out an H600 floody with am optional throw reflector bezel like the Spark I'd probably be all over that.
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yeah it is visually bulky. there is some space in the tube also(why why why?). maybe it was because the silicone holders of the sd6 and sd52 seem identical which could streamline manufacturing process. sd52 size makes sense. space for 2aa with no leftover space. i think the sd6 could go on a visual diet. keep the mid section the same size to where it meets the silicone holder. then make both ends thinner to just fit the battery.
actually, i think it would be cool if they had a "light" version and just shave all the fins off to lighten the light. especially for people who don't necessarily push it to the limits.
it's not too bad though because let's face it, headlamps are always and will forever be the "geeky" light choice. thin, fat, small, big. it will always incite giggles.
the sd52 has some quirky behavior. with nimhs it doesn't always save the last mode. also with nimhs, it doesn't always start on the first try.
i'm not sure if these issues have been addressed in the current batch though.
one con of the sd52 is there is no lockout feature based on it's design.
i understand why people get it. there is nothing like streamlining your gadget system in terms of energy source(swappable, backup, same charger, weight savings etc)
the swappable screw in reflector is the sd series is the trump card in my opinion. easily they could have made more money making several versions of the light. this makes it easy to fine tune the light to your task.
i think the sd series is the most versatile headlamp in the market now. i can't imagine ever selling it in the future.