"But, Zebralight is a significant step up, all around, including the cost."
I'm missing something here, Greg.
Zebralight H52w specs
LED: Cree XM-L2 Neutral White (Norminal CCT 4400K)
User Selectable Levels: 3 main levels (High, Medium and Low). Each main level can be programmed to one of its two sub-levels. The second sub-level of the each main levels can be further programmed to different brightness levels.
Light Output (runtimes)
High: H1 280 Lm (0.9 hrs) or H2 172 Lm (1.7 hrs) / 108 Lm (3 hrs)
Medium: M1 50 Lm (7.5 hrs) or M2 25 Lm (12 hrs) / 12 Lm (27 hrs)
Low: L1 2.7 Lm (4 days) or L2 0.34 Lm (3 weeks) / 0.06 Lm (2 months) / 0.01 Lm (3 months)
Beacon Strobe Mode: 4Hz Strobe at H1 / 19Hz Strobe at H1
Light output are ANSI out the front (OTF) values. Runtimes tested (and parasitic drain estimated) using Sanyo 2000mAh Eneloop AA batteries. Light output with 14500 batteries are the same except that the H1 is 500Lm for the first minute and then step down to 280Lm.
Operating Voltage Range: 0.7V - 4.2V
Battery: One 1.5V AA (NiMH, lithium or alkaline) or 3.7V 14500 li-ion rechargeable. Batteries are not included in the package.
Parasitic Drain: Negligible (much less than the self discharging of a battery)
80 degree spill
12 degree hot spot
Head Diameter: 0.86 inch (21.8 mm)
Length: 3 inch (76.5 mm)
1.1 oz (32 gram)
2.9 oz (80 gram) with an Eneloop AA and headband
Battery capacity indicator (LED flashes 1-4 times, 4 short clicks to start)
All levels are current regulated
Low battery alert when the light is switched Off (LED flashes if the battery voltage is below 1.06V)
Automatic stepping down to lower output when battery (AA and 14500) capacity is low
Builtin over-discharging protection for 14500 batteries at 2.8V cutoff
Durable electronic soft-touch switch
Smart user interface provides fast and easy access to all brightness levels and beacon-strobes.
Precision machined unibody casing from premium grade aluminum bar stocks
Proprietary heat sinking design bonds the LED board directly to the unibody aluminum casing
Durable natural hard anodized finish (Type III Class I)
Sealed and potted LED driver circuitry
Tempered optical grade glass
Battery power can be disconnected by slightly unscrewing the tailcap to prevent unwanted activations or parasitic drain
Waterproof to IPX7 (2 meters, 30 minutes)
PT VIZZ specs
Maxbright LED, Ultrabright White LED, Ultrabright Red LED
My comment, as the specs don't seem to copy well, at least for me.
Burn time with the 165 lumen LED is 110 hours, 120 with the Ultrabright LED's, and 150 hours with the red LED's.
3 AAA Alkaline or Lithium
My comment: With lithium batteries my VIZZ weighs in at 3.0 oz.
The Vizz is feature-loaded with three distinct beam profiles easily accessed via a simple press, hold, or double press of the button. One Maxbright LED creates a powerful 165 lumen spot beam for long-throw illumination, a pair of white Ultrabright LEDs deliver a dimmable flood beam, and two red Ultrabright LEDs handle close-range lighting while preserving night adjusted vision. When not in use the Vizz can be locked to prevent accidental turn on, and the translucent switch acts as a low battery indicator. As with all of PTEC Professional Series headlamps, the Vizz is waterproof (IPX7) and is equipped with regulated circuitry making the Vizz lithium battery compatible.
•Single 165-lumen Maxbright LED throws a bright white beam up to 90m on high; 2 white 5mm LEDs? output 30 lumens? and reach up to 23m on high
•Also includes 2 red LEDs? that output 15 lumens? and reach up to 20m.; red LEDs? minimize the impact on your night vision
•White 5mm LEDs? are dimmable so you can balance light output and battery life to meet your needs
•3 AAA batteries (included) provide 110 hrs. of burn time for the Maxbright LED; using the 5mm white LEDs?, the batteries provide 160 hrs. of operation
•Switch to the red LEDs? and the batteries will last for 150 hrs.
•Regulated circuitry ensures consistent power output over the lifespan of the batteries
•Large push-button switch is easy to operate with gloves on
•The Princeton Tec Vizz headlamp has an IPX7? rating (protected against water immersion down to 1m for 30 min.)
Price: Zebralight H52w $64
PT VIZZ $49.50
Edited: My comment
The VIZZ also has a locking facility to prevent accidental turn on of light without partially unscrewing the battery chamber cap. Which brings up the nightmare scenario of
taking a dunking with the H52w cap partially unscrewed.
So, I guess my question is: How is the Zebralight H52w a significant step up all around?
Seriously, I suspect you know a lot more about the technology, and I am very much aware that I amy be missing something. But, I just can't figure it out. Maybe I just chose the wrong Zebralight model for comparison?