Zebralight H51F

[red02]

Liking the fact they post .2 lumens for second low! Finally a moon mode comparable to the Quark, or even in the general neighborhood of Novatac.

If we assume that angle of emission is 90 degrees, and that the light is perfectly normal to the wall then the radius of the incident spot should be equal to the distance between the emitter and the spot. 0.2lm spread over an area of 3.14m^2 give you about 0.06lux at 1m. For some reason I keep thinking that the lux of moonlight spot on the quark was 10lux?

Too tired to know if any of this is right...

 

[swrdply400mrelay]

100lm for 2hrs seems impressive, was the test done using a 2700mAh eneloop or a 2000mAh one? I wonder how much lux we will see with this level... I hope the beam looks as good as the specs.

It doesn't seem like there was any improvement on run time. The H501 specs are 96 lumens for 2.3 hrs.

 

[red02]

It doesn't seem like there was any improvement on run time. The H501 specs are 96 lumens for 2.3 hrs.

The difference is probably going to be slight. However, the test for the H501 was done with a 2.7 Ah battery and now its being done with a 2 Ah battery. So its probably going to be around 1.8hrs at 100lm for the H51F. The important point is that it will be less lux and it will seem more like 80 or so lm.

So its going to be dimmer (in terms of irradiance) than the 501.

 

[Mikellen]

Well this H51 is due next month:

http://www.zebralight.com/H51-Headlamp-AA-200Lm_p_37.html




However it seems like the medium modes are really spaced too close. Also no 14500 support:



LED: Cree XP-G Cool White (color temperature 6100-6500 K)
User Selectable Modes: 3 (High, Medium and Low). Each mode can be configured to one of the two sub-levels.
Light Output
High: H1 200 Lm (0.9 hrs) or H2 100 Lm (2.1 hrs)
Medium: M1 30 Lm (12 hrs) or M2 8 Lm (39 hrs)
Low: L1 2.5 Lm (3 days) or L2 0.2 Lm (19 days)
Light output are out the front (OTF) values. Runtime tests are done using Sanyo Eneloop AA batteries.
Voltages: 0.7V - 2.5V
Battery: One 1.5V AA (NiMH, lithium or alkaline). 14500 Li-ion batteries are not supported. Batteries are not included in the package.
Parasitic Drain: Negligible (equivalent to 140 years)
Dimensions
Diameter: 0.90 inch (23 mm)
Length: 3.2 inch (81 mm)
Weight
1.2 oz (35.8 gram)
2.2 oz (61.9 gram) with an Eneloop AA
3.0 oz (84.9 gram) with an Eneloop AA and headband



Hopefully this means the H51F will be out soon!

"Parasitic Drain: Negligible (equivalent to 140 years)"

According to the specifications in the link that you provided the parasitic drain is equal to 16 years. 😕

 

[FroggyTaco]

Either way it's beyond current battery longevity so does it really matter?

 

[Mikellen]

Either way it's beyond current battery longevity so does it really matter?

Maybe it does, maybe it doesn't. I must admit that I have a mental hang up with lights that have a parasitic drain. It might seem silly to some but that's what keeping me from purchasing one of the RA lights. Anyway, I would like to know the correct information regarding the parasitic drain discharge rate. 🙂

 

[ZebraLight]

"Parasitic Drain: Negligible (equivalent to 140 years)"

According to the specifications in the link that you provided the parasitic drain is equal to 16 years. 😕

The '16 years' is correct.

 

[swrdply400mrelay]

The difference is probably going to be slight. However, the test for the H501 was done with a 2.7 Ah battery and now its being done with a 2 Ah battery. So its probably going to be around 1.8hrs at 100lm for the H51F. The important point is that it will be less lux and it will seem more like 80 or so lm.

So its going to be dimmer (in terms of irradiance) than the 501.

Sorry, my mistake, I didn't even notice the two were done using different capacity batteries. I assumed Zebralight would test using the same capacity cell to make the run time values comparable between models.

 

[Linger]

I give a +1 for Eneloop testing. It just makes the results so practical.

Sad there's no 14500 option.

 

[silverglow]

Hi all,

I wanted to use my introduction to the forum to let you know the response I got from Zebralight regarding my inquiry to when the H51F will be available and they wrote (as of August 3rd 2010):

"The H51F is scheduled to be released in mid-late September."

I thought that was pretty good news, although it might be postponed of course.

I already treated myself to a H51 some days ago (well, I placed the order), but I'm also looking forward to the H51F as a complementing light (preferably as a Neutral White), as it looks like it will be a very promising headlight from what I've read here so far (and both with the XP-G!).

I'm quite the newbie regarding flashlights though, I only have a very very modest collection (1 Fenix E01, 1 Eagletac P10A2, 1 ITP A3 EOS upgraded and soon the ZL H51 and a Quark Mini AA).

Regards,

silverglow

 

[Zendude]

Welcome to CPF silverglow! It's good to have you here.:wave:

 

[Zenster]

The '16 years' is correct.

Interestingly enough, 16 years is longer than the typical "Good Until" date on a brand new, fresh, Alkaline or Lithium battery.

Sounds to me that a battery will keep it's charge longer in the H51 than it will in it's original packaging.


Good job! 😀

 

[Zenster]

Hi all,

I wanted to use my introduction to the forum to let you know the response I got from Zebralight regarding my inquiry to when the H51F will be available and they wrote (as of August 3rd 2010):

silverglow

I'm very interested in this, but I'm wondering; an H51F won't have a hotspot since it's a floody.
So won't it be simply an "upgrade" to the H501 except for more lumens?

Logically, it would seem to me that the H51F, due to it's other similarities to the H501, would be a replacement and successor to the H501. Therefore, I wonder if the H501 might then be discontinued as a redundant item in the product line?

I'm either going to get another H501W, or an H51W (if it's made in a neutral tint), so I guess I need to wait a bit to see how the development of the H51(W) plays out. Soon, I hope.

 

[Mikellen]

Interestingly enough, 16 years is longer than the typical "Good Until" date on a brand new, fresh, Alkaline or Lithium battery.

Sounds to me that a battery will keep it's charge longer in the H51 than it will in it's original packaging.


Good job! 😀

Combine the self discharge of the battery with the parasitic drain and this will result in a shorter life expectancy of the battery. I don't know if the electronics in the flashlight/headlamp are so accurate in the sense that every unit will have the same amount of parasitic current draw, so I wonder if the particular unit someone purchases can have a higher parasitic draw.
This might not be so apparent to the user and can leave one wondering why there batteries are not holding a charge like they should.

I guess if you use your flashlight/headlamp enough this shouldn't be an issue. If after the 'honeymoon" stage is over with your new light or one is in pursuit of more lumens and better efficiency from advanced technology as time passes on then it is quite possible that the flashlight will be relegated as an emergency, car, or B.O.B. light. In this situation the flashlight should have the battery removed until the flashlight is needed or the tailcap loosened to disconnect the circuit which can be done with the Zebralights.
On some other name brand lights that have this "parasitic drain" feature there is no way to prevent it without removing the battery.

YMMV and my 2 cents. :candle:

 

[psychbeat]

couldnt you just unscrew the tail cap slightly?

kind of like locking out a surefire?

zebra UI is pretty sick and worth the drain IMO

 

[davidt1]

Hi all,

I wanted to use my introduction to the forum to let you know the response I got from Zebralight regarding my inquiry to when the H51F will be available and they wrote (as of August 3rd 2010):

"The H51F is scheduled to be released in mid-late September."

I thought that was pretty good news, although it might be postponed of course.

I already treated myself to a H51 some days ago (well, I placed the order), but I'm also looking forward to the H51F as a complementing light (preferably as a Neutral White), as it looks like it will be a very promising headlight from what I've read here so far (and both with the XP-G!).

I'm quite the newbie regarding flashlights though, I only have a very very modest collection (1 Fenix E01, 1 Eagletac P10A2, 1 ITP A3 EOS upgraded and soon the ZL H51 and a Quark Mini AA).

Regards,

silverglow

Thanks for the information. That is my next ZL light. And after that it's the SC51. I might get a H51 too, if it can provide some reasonable fake flood with some scotch tape.

 

[Shorty66]

I ordered a H51 and will test a number of mods to get it floody (petzl diffusor, scotchtape and what else comes to my mind).
I will post some beamshots and so on for you david.

 

[silverglow]

Thanks for the warm welcome, Zendude :wave: !

Zenster wrote:

Logically, it would seem to me that the H51F, due to it's other similarities to the H501, would be a replacement and successor to the H501. Therefore, I wonder if the H501 might then be discontinued as a redundant item in the product line?

Yes, one would think it will be discontinued, except if the demand for the H501 remained high enough, but as I'm not connected to Zebralight, I can only speculate of course. I will also be very interested in the opinions of members here who will own both lights, the H51F and H501.

davidt1 wrote:

Thanks for the information. That is my next ZL light. And after that it's the SC51. I might get a H51 too, if it can provide some reasonable fake flood with some scotch tape.

You're welcome! A reasonable scotch tape fake flood solution would be cool of course, but I will probably buy a H51F sooner or later anyway, just to have a real flood light, if it turns out to be an improvement over the H501.

Shorty66:

I'm also looking forward to your beamshots!

 

[davidt1]

I ordered a H51 and will test a number of mods to get it floody (petzl diffusor, scotchtape and what else comes to my mind).
I will post some beamshots and so on for you david.

Thank you. Looking forward to your pictures and comments.

 

[Beacon of Light]

Anyone hear an update on either the H31F or the H51F?