photonhoer
Newly Enlightened
FieldTest on Zebralight Q5
Location: My wife and I just returned from 2 weeks in rainforest jungle in Guyana, South America. Average temp ~90-100+ F. Humidity, constant 100%.
Pattern of Use: We had to rise before sunrise, and go to bed well after sunset, so our usage ran about 4-6 hrs per day each, for 15 days. We set up camp (tents, etc), purified water, cooked meals, read a little, did paperwork, organized medical supplies, "showered", and walked to the river and latrine every day in a different village - in the dark. Personal lighting was one of the most important tools we had with us.
Form Factor: This light is terrific. It is small, light weight, multi-leveled, usefully bright and dim, very well regulated, and very efficient. The right-angled emitter is a terrific design for this use!! And the soft shield really eliminates the spill from hitting an eyeglass wearer. (We had a PT Apex along for internal body cavity illumination; it did fine for that task, but we could hardly wait to get its weight off ones head and use the ZL when its flood was appropriate.) Furthermore, after being caught in the dark at a dirt airstrip and having to walk a mile to the village along unfamiliar and uneven trails, we took to carrying the ZL+headband in our pockets all day long; virtually no weight or bulk meant that we always had a light with us.
Silicon Brackets: We found these worked very well. Due to weight limitations, we only took the headband and its one bracket. It was light, comfortable, and easier to find in the dark due to the glow properties. Some have speculated about spontaneous rotation in the bracket – we found none. It is appropriately easy to adjust the angle up and down (much easier and wider range of motion than any of the other 8-10 headlamp I have owned,) but neither walking, vigorous up and down head motion, nor an occasional jog ever resulted in the light changing from the angle we set for it. Terrific design, well implemented.
Battery Usage: Due to weight, temperature and run-time considerations, we used Energizer AA Lithium L91s exclusively. (For medical examination and surgery purposes, we had three other lights along, both LEDs and incandescents. A vital criterion was to get all lights using the same primary battery, as no mains power was ever available to recharge anything.) This gave us UNBELIEVEABLY LONG RUN TIMES. Using Zebralight's advertised continuous run-times, we took several batteries apiece for each light. In reality, we used each light longer each day than we had estimated, and we came home with the original battery in each light still producing full output. This means, that we got at least 75 hours of use on one battery, being pretty much "on" full time in each 4-6 hr daily chunk of use, in a mixed pattern of (roughly) 60% low, 30% medium, and 10% high level. Perhaps others will not be so impressed, but I was flabbergasted and delighted that I got this much appropriately-scaled, evenly-regulated light from one AA battery!! WOW!! Next time we will not take nearly so many backup batteries.
Light Pattern (Wide-Angle Flood): We knew full well that a flood pattern would not be the most useful for every purpose, and it was not good for illuminating surgical/biopsy sites and internal body cavity locations. But, it was virtually perfect for all our camp/living/reading/record keeping chores. The even light from the edge of peripheral vision to the center of a task was wonderful. Not having to move ones head to see something just off-center increased efficiency and reduced the psychological annoyance of living in a "light tunnel." Everyone around us marveled at how evenly the lights illuminated things, and I would say that this is the most useful general task light I can imagine. (Some have questioned whether the flood pattern is more annoying by shining in the eyes of another while talking face-to-face; our prolonged experience was that indeed it has a wider angle of hitting another in the face, but the light is less concentrated and so is certainly not more annoying than a focused beam, and it is so easy to rotate the ZL to shine directly upward that one does it quickly and evenly, maintaining overall illumination without blasting ones conversations.) We used the ZL to illuminate trips to the river and the latrine once we knew the general direction of the object. However, two situations presented themselves in which the ZL was not the light of choice (nor was it designed to be).
First, looking for an unfamiliar object or trail at some distance (30-60 meters) calls for a stronger central spot, for which we had a pair of Fenix L1D-CEs, which served perfectly. (Had a L2D-CE body along, but never needed to use it.)
Second, at times we wanted to illuminate a room with general light from a site remote from ones body, as when cooking or using a solar shower; aiming the ZL at the ceiling meant that the very wide angle dispersion hit one in the eyes unless the ZL was placed on a pretty high surface. By contrast, tail standing the L1D-CE with its narrower beam worked much better.
So, as I imagine everyone knows, no light is perfect for everything, and the ZL is no exception. When a focused beam is needed, that is what is needed. But for the usage on this mission, the ZL's flood pattern was simply excellent at 95+% of the daily tasks we needed to illuminate, and I for one cannot ask for better than that.
Switch (Twisty): Changing levels is a simple and easy series of off-on twists, facilitated by a short but noticeable pause in the off position when moving to the next level. I was delighted NOT to have a blinking pattern in this light; to me this is a task light, and flashing is not useful when doing work-oriented tasks (tho I do like and use the strobe mode in my L1D-CE when walking on narrow roads in the dark to really get the drivers' attention.) There is no doubt that it would be more convenient if the ZL could change levels one-handed, e.g., with a clicky switch of some kind (I very much like the switch on the Fenix L1D-CE). BUT… I would not want to compromise the weight, size, or reliability of this light just to get one-handed operation. I must have changed levels a minimum of 15 times a night for 15 nights, so I have enough experience to conclude for myself that it really is not that annoying, and I would opt to retain the light weight and reliability as more important priorities.
Overall: A truly useful light, extremely well implemented. Quality is excellent, performance is brilliant. In combination with a light like the L1D-CE, we had exactly what we wanted and needed when we truly had to depend on small, hand lights for every aspect of our lives. I would buy the Zebralights again, and would recommend them highly. 5 Stars.
*************************************
Post Script 10/30: First, thanks to so many of you for your complementary remarks. Frankly, it was a pleassure to pull together my evaluation of this light that served us so very well in a situation of real necessity. I am quite certain that if we had had to spend the same number of hours illuminating our lives with the more focused beam of most lights, the situation would have seemed substantially more stressful. Having a broad field of even light in front of us was so much more natural than living in the tunnel of light from most lamps. Working on tasks, especially searching for something and writing notes and filling out patient record forms, was so much easier and more natural than in a narrower field of light.
Second point: I did not really say anything above about the objective of the trip since I did not want to bore the reader. But, since several of you have asked, yes it was a medical trip. My wife is a gynecologist and I am a psychologist. We like to volunteer in remote, interesting and adventurous places as often as possible. (Last year we went to Rwanda, where the genocide took over a million lives in 1994.) This year we went to Guyana (where, totally unrelated to the purpose of our trip, Jim Jones coerced lethal doses of cyanide into over 700 of his People's Temple members in 1978. Remember, "Don't Drink the Coolaid!"?) In Guyana we worked with the native AmerIndian tribes who live deep in the interior. There are no land roads to these places. It is a several week walk along one-track trails to the nearest city. One has to fly into one of the few regional dirt airstrips, and then travel by river in dug-out canoes. Like backpackers, we carried everything we needed, living in tents, "cooking" freeze-dried dinners on a one burner stove, having CliffBars for breakfast and lunch, and carrying all our personal and medical gear from village to village each day. We had torential rain most days (even tho it was the "dry" season), and the temp and humidity made it very physically stressful. The point of the trip was to address the fact that the AmerIndian women have one of the highest rates of cervical cancer in the world, and seemingly caused by a diffrent strain of the Human Papilloma Virus than American and European women suffer from. It was a facinating experience, and we are still deciding whether to make this a regular commitment on the calendar. (I played secretary, handling medical records; my wife was the key player!)
*********************************
Update 6/11/08
An UPDATE after several months: Two of these little devils didn't seem enough - one for my wife, one on my bedside table for middle of the night reading when we are not traveling, but I wanted one for my pocket.
So, I ordered a third Zebralight - and after it arrived I felt that the threads on the end cap to turn it on and off were a little rough. So I cleaned them and lubricated them, but still it was "stiff". Ocular examination "revealed" that there were burrs on the threads inside the cap.
One email to Zebralight got the following response:
"Please send the defective lamp only (without all accessories) to ZebraLight. We will send you the replacement this week. Sorry about the problem."
Lo and behold, 2 week later I received a new light, and the threads are butter smooth. These guys are great!!
[For the record, I have no relationship with nor any compensation whatsoever from Zebralight. They just build a TERRIFIC product.]
I am really lookig forward to the new AA formfactor- ?the 51? We simply cannot do multiple battery types in our work, and the AA has a terrific weight/size/power ratio, so... bring the new ones on!!!
Location: My wife and I just returned from 2 weeks in rainforest jungle in Guyana, South America. Average temp ~90-100+ F. Humidity, constant 100%.
Pattern of Use: We had to rise before sunrise, and go to bed well after sunset, so our usage ran about 4-6 hrs per day each, for 15 days. We set up camp (tents, etc), purified water, cooked meals, read a little, did paperwork, organized medical supplies, "showered", and walked to the river and latrine every day in a different village - in the dark. Personal lighting was one of the most important tools we had with us.
Form Factor: This light is terrific. It is small, light weight, multi-leveled, usefully bright and dim, very well regulated, and very efficient. The right-angled emitter is a terrific design for this use!! And the soft shield really eliminates the spill from hitting an eyeglass wearer. (We had a PT Apex along for internal body cavity illumination; it did fine for that task, but we could hardly wait to get its weight off ones head and use the ZL when its flood was appropriate.) Furthermore, after being caught in the dark at a dirt airstrip and having to walk a mile to the village along unfamiliar and uneven trails, we took to carrying the ZL+headband in our pockets all day long; virtually no weight or bulk meant that we always had a light with us.
Silicon Brackets: We found these worked very well. Due to weight limitations, we only took the headband and its one bracket. It was light, comfortable, and easier to find in the dark due to the glow properties. Some have speculated about spontaneous rotation in the bracket – we found none. It is appropriately easy to adjust the angle up and down (much easier and wider range of motion than any of the other 8-10 headlamp I have owned,) but neither walking, vigorous up and down head motion, nor an occasional jog ever resulted in the light changing from the angle we set for it. Terrific design, well implemented.
Battery Usage: Due to weight, temperature and run-time considerations, we used Energizer AA Lithium L91s exclusively. (For medical examination and surgery purposes, we had three other lights along, both LEDs and incandescents. A vital criterion was to get all lights using the same primary battery, as no mains power was ever available to recharge anything.) This gave us UNBELIEVEABLY LONG RUN TIMES. Using Zebralight's advertised continuous run-times, we took several batteries apiece for each light. In reality, we used each light longer each day than we had estimated, and we came home with the original battery in each light still producing full output. This means, that we got at least 75 hours of use on one battery, being pretty much "on" full time in each 4-6 hr daily chunk of use, in a mixed pattern of (roughly) 60% low, 30% medium, and 10% high level. Perhaps others will not be so impressed, but I was flabbergasted and delighted that I got this much appropriately-scaled, evenly-regulated light from one AA battery!! WOW!! Next time we will not take nearly so many backup batteries.
Light Pattern (Wide-Angle Flood): We knew full well that a flood pattern would not be the most useful for every purpose, and it was not good for illuminating surgical/biopsy sites and internal body cavity locations. But, it was virtually perfect for all our camp/living/reading/record keeping chores. The even light from the edge of peripheral vision to the center of a task was wonderful. Not having to move ones head to see something just off-center increased efficiency and reduced the psychological annoyance of living in a "light tunnel." Everyone around us marveled at how evenly the lights illuminated things, and I would say that this is the most useful general task light I can imagine. (Some have questioned whether the flood pattern is more annoying by shining in the eyes of another while talking face-to-face; our prolonged experience was that indeed it has a wider angle of hitting another in the face, but the light is less concentrated and so is certainly not more annoying than a focused beam, and it is so easy to rotate the ZL to shine directly upward that one does it quickly and evenly, maintaining overall illumination without blasting ones conversations.) We used the ZL to illuminate trips to the river and the latrine once we knew the general direction of the object. However, two situations presented themselves in which the ZL was not the light of choice (nor was it designed to be).
First, looking for an unfamiliar object or trail at some distance (30-60 meters) calls for a stronger central spot, for which we had a pair of Fenix L1D-CEs, which served perfectly. (Had a L2D-CE body along, but never needed to use it.)
Second, at times we wanted to illuminate a room with general light from a site remote from ones body, as when cooking or using a solar shower; aiming the ZL at the ceiling meant that the very wide angle dispersion hit one in the eyes unless the ZL was placed on a pretty high surface. By contrast, tail standing the L1D-CE with its narrower beam worked much better.
So, as I imagine everyone knows, no light is perfect for everything, and the ZL is no exception. When a focused beam is needed, that is what is needed. But for the usage on this mission, the ZL's flood pattern was simply excellent at 95+% of the daily tasks we needed to illuminate, and I for one cannot ask for better than that.
Switch (Twisty): Changing levels is a simple and easy series of off-on twists, facilitated by a short but noticeable pause in the off position when moving to the next level. I was delighted NOT to have a blinking pattern in this light; to me this is a task light, and flashing is not useful when doing work-oriented tasks (tho I do like and use the strobe mode in my L1D-CE when walking on narrow roads in the dark to really get the drivers' attention.) There is no doubt that it would be more convenient if the ZL could change levels one-handed, e.g., with a clicky switch of some kind (I very much like the switch on the Fenix L1D-CE). BUT… I would not want to compromise the weight, size, or reliability of this light just to get one-handed operation. I must have changed levels a minimum of 15 times a night for 15 nights, so I have enough experience to conclude for myself that it really is not that annoying, and I would opt to retain the light weight and reliability as more important priorities.
Overall: A truly useful light, extremely well implemented. Quality is excellent, performance is brilliant. In combination with a light like the L1D-CE, we had exactly what we wanted and needed when we truly had to depend on small, hand lights for every aspect of our lives. I would buy the Zebralights again, and would recommend them highly. 5 Stars.
*************************************
Post Script 10/30: First, thanks to so many of you for your complementary remarks. Frankly, it was a pleassure to pull together my evaluation of this light that served us so very well in a situation of real necessity. I am quite certain that if we had had to spend the same number of hours illuminating our lives with the more focused beam of most lights, the situation would have seemed substantially more stressful. Having a broad field of even light in front of us was so much more natural than living in the tunnel of light from most lamps. Working on tasks, especially searching for something and writing notes and filling out patient record forms, was so much easier and more natural than in a narrower field of light.
Second point: I did not really say anything above about the objective of the trip since I did not want to bore the reader. But, since several of you have asked, yes it was a medical trip. My wife is a gynecologist and I am a psychologist. We like to volunteer in remote, interesting and adventurous places as often as possible. (Last year we went to Rwanda, where the genocide took over a million lives in 1994.) This year we went to Guyana (where, totally unrelated to the purpose of our trip, Jim Jones coerced lethal doses of cyanide into over 700 of his People's Temple members in 1978. Remember, "Don't Drink the Coolaid!"?) In Guyana we worked with the native AmerIndian tribes who live deep in the interior. There are no land roads to these places. It is a several week walk along one-track trails to the nearest city. One has to fly into one of the few regional dirt airstrips, and then travel by river in dug-out canoes. Like backpackers, we carried everything we needed, living in tents, "cooking" freeze-dried dinners on a one burner stove, having CliffBars for breakfast and lunch, and carrying all our personal and medical gear from village to village each day. We had torential rain most days (even tho it was the "dry" season), and the temp and humidity made it very physically stressful. The point of the trip was to address the fact that the AmerIndian women have one of the highest rates of cervical cancer in the world, and seemingly caused by a diffrent strain of the Human Papilloma Virus than American and European women suffer from. It was a facinating experience, and we are still deciding whether to make this a regular commitment on the calendar. (I played secretary, handling medical records; my wife was the key player!)
*********************************
Update 6/11/08
An UPDATE after several months: Two of these little devils didn't seem enough - one for my wife, one on my bedside table for middle of the night reading when we are not traveling, but I wanted one for my pocket.
So, I ordered a third Zebralight - and after it arrived I felt that the threads on the end cap to turn it on and off were a little rough. So I cleaned them and lubricated them, but still it was "stiff". Ocular examination "revealed" that there were burrs on the threads inside the cap.
One email to Zebralight got the following response:
"Please send the defective lamp only (without all accessories) to ZebraLight. We will send you the replacement this week. Sorry about the problem."
Lo and behold, 2 week later I received a new light, and the threads are butter smooth. These guys are great!!
[For the record, I have no relationship with nor any compensation whatsoever from Zebralight. They just build a TERRIFIC product.]
I am really lookig forward to the new AA formfactor- ?the 51? We simply cannot do multiple battery types in our work, and the AA has a terrific weight/size/power ratio, so... bring the new ones on!!!
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