Is 6200 lumen noticeably brighter than 5000 lumens?

22 posts / 0 new
Last post
Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas
Is 6200 lumen noticeably brighter than 5000 lumens?

OK, I'm comparing both of my LED lights, the Acebeam K65 and the Sofirn Q8. Both uses 4x18650 bats and since I only have a set It's in one or the other. Now when I compared them they seemed to match up but the K65 is 6200L and the Q8 is 5000L at the max.

 

The Q8 seems to be brighter because it's very white lighted while the K65 was yellowish. The K65 was used so it could be worn out and I think the problems I'm having with it seems to be the switch. Makes sense as it's the only moving part of the light.

richbuff
Offline
Last seen: 9 hours 17 min ago
Joined: 09/22/2015 - 20:38
Posts: 261
Location: Prescott Az

No. Smile

 

...and: What is the nature of your comparative environment? Small white room ceiling bounce? Aim down the center of the street?

Yes, it also has normal modes for normal runtime and normal heat generation.  Phil 1: 21-24

Unheard
Offline
Last seen: 3 hours 50 min ago
Joined: 01/16/2019 - 11:38
Posts: 386
Location: Germany

The Q8 can be used with a single cell. It’s a parallel circuit.

Maybe you have a camera with a manual mode? You could keep exposure, ISO, and WB constant and take pictures for both lights. Please show Smile

Sirstinky
Offline
Last seen: 5 hours 35 min ago
Joined: 11/02/2018 - 17:07
Posts: 327
Location: Vancouver, WA

Perceived brightness and actual brightness in those output figures is like comparing 1200 degrees to 1800 degrees. Your eyes and skin won’t be able to tell the difference. Also the color temperature of the light makes it complicated since 5700k seems brighter than 4000k even though the actual
lumen #‘s aren’t far off.

Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas

The test was outside at night. Shining them at faraway buildings and the Q8 show them up better than the K65. It could be because of the color spectrum. The flood parts seems to be the same.

 

That's $65 Q8 vs the $120 K65 (new was $200) and the $65 Q8 won.

Pete7874
Pete7874's picture
Offline
Last seen: 8 hours 25 min ago
Joined: 11/23/2011 - 16:47
Posts: 3035
Location: USA

Quote:
Is 6200 lumen noticeably brighter than 5000 lumens?
To the naked eye, no.
FlashPilot
FlashPilot's picture
Offline
Last seen: 3 hours 18 min ago
Joined: 05/10/2010 - 16:07
Posts: 4639
Location: USA

As a generality, each time lumens are doubled, the human eye perceives about a 20% increase in apparent brightness.

Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas

That makes sense. I guess I expected too much out of the K65. Too bad it's bad.

SIGShooter
SIGShooter's picture
Offline
Last seen: 6 hours 37 min ago
Joined: 07/14/2013 - 02:10
Posts: 1912
Location: northern california

Old Frog wrote:

The test was outside at night. Shining them at faraway buildings and the Q8 show them up better than the K65. It could be because of the color spectrum. The flood parts seems to be the same.


 


That’s $65 Q8 vs the $120 K65 (new was $200) and the $65 Q8 won.

Of course the Q8 won, after all it was BLF project Smile

9mm/40cal/45cal bullets and large/small pistol primers available for sale in San Francisco Bay area

flydiver
Offline
Last seen: 11 hours 35 min ago
Joined: 06/19/2013 - 19:16
Posts: 1008
Location: Seattle, WA

Had the same issue with my first Convoy S2, one with 4×7135 and the other with 8×7135. To my eye they were exactly the same on high.

BurningPlayd0h
BurningPlayd0h's picture
Offline
Last seen: 9 hours 49 min ago
Joined: 06/22/2018 - 02:16
Posts: 939
Location: MN
flydiver wrote:
Had the same issue with my first Convoy S2, one with 4×7135 and the other with 8×7135. To my eye they were exactly the same on high.

Keep in mind their is a mode group on the Biscotti S2s that sets 50% as the max output setting. Be sure both lights have the same output settings enabled before comparing.

raccoon city
raccoon city's picture
Offline
Last seen: 2 hours 49 min ago
Joined: 10/06/2010 - 02:35
Posts: 13973
Location: रॅकून सिटी Palm Desert CA USA

6200 lumens appears to be 11% brighter than 5000 lumens, which is not very noticeable.

Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas

The weather outside is really nasty, wet and cold so I did a hallway test instead. Surprised me how they compared. Your responses?

 

Q8:

 

<a href='https://postimg.cc/5jGgw9Qt' target='_blank'><img src='https://i.postimg.cc/NfGnv5gR/IMG-20200213-221139.jpg' border='0' alt='IMG-20200213-221139'/></a>

 

K65:

 

<a href='https://postimg.cc/vcVzXR5t' target='_blank'><img src='https://i.postimg.cc/8Py0pN59/IMG-20200213-221419.jpg' border='0' alt='IMG-20200213-221419'/></a>

 

Q8 wins.

 

 

 

BurningPlayd0h
BurningPlayd0h's picture
Offline
Last seen: 9 hours 49 min ago
Joined: 06/22/2018 - 02:16
Posts: 939
Location: MN
Old Frog wrote:

The weather outside is really nasty, wet and cold so I did a hallway test instead. Surprised me how they compared. Your responses?


 


Q8:


 


<a href=‘https://postimg.cc/5jGgw9Qt’ target=’_blank’><img src=‘https://i.postimg.cc/NfGnv5gR/IMG-20200213-221139.jpg’ border=‘0’ alt=‘IMG-20200213-221139’/></a>


 


K65:


 


<a href=‘https://postimg.cc/vcVzXR5t’ target=’_blank’><img src=‘https://i.postimg.cc/8Py0pN59/IMG-20200213-221419.jpg’ border=‘0’ alt=‘IMG-20200213-221419’/></a>


 


Q8 wins.


 


 


 

The K65 is just a throwier light. The Q8 is lighting more of the stuff to the sides with its brighter spill, but look at from the hotspot of the K65… that’s light being reflected from the hotspot and it’s clearly brighter than the Q8 in that regard.

Really though without putting these in a lumen tube or sphere there’s no way to know for sure. But some things to consider:
1 – The Q8 will gradually dim as the cells have lower voltage. You will only have max output with fully charged cells.
2 – There are many reason other than sheer output to buy an Acebeam. I think they have much better construction and QC than Thorfire/Sofirn (< no that theirs is BAD by any means) and would just generally be more dependable.

The K65 may be using a buck and/or boost circuit in its driver which should give better efficiency or at least even better sustained output over the Q8 as well.

Unheard
Offline
Last seen: 3 hours 50 min ago
Joined: 01/16/2019 - 11:38
Posts: 386
Location: Germany

The Acebeam appears to have a much brighter spot. Nice searchlight.

Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas

The K65 uses the batteries in series so it's 16+ volts. The Q8 are all parallel so I guess it's amp driven. I see that the K65 is everything it's meant to be but with a faulty switch. Also the head has a burnt smell.

 

I see better with the Q8 than I do with the K65. I can't see the K65 selling for $200 when I got it for $120. Later I found out it was a used item.

 

After comparing the Q8 and the K65 the Q8 was a lot better deal at $65.

Pete7874
Pete7874's picture
Offline
Last seen: 8 hours 25 min ago
Joined: 11/23/2011 - 16:47
Posts: 3035
Location: USA

Old Frog wrote:
The flood parts seems to be the same.

Judging by the photos you posted above, the Q8 appears more floody.
Old Frog
Offline
Last seen: 15 hours 29 min ago
Joined: 02/05/2020 - 14:02
Posts: 51
Location: Texas

As I have learned but they seemed to be the same outside.

legan710
legan710's picture
Offline
Last seen: 1 day 11 hours ago
Joined: 03/25/2017 - 19:37
Posts: 67
Location: Germany

Even neglecting the fact that two different lights can have total different characteristics (throw, tint and all that) I would argue that there is almost no visible difference between 5000 lumen and 6000 lumen. On that level a difference of 1000 lumen is just not that much.

compare 300 to 1300 lumens and its like day and night – but 5000 vs 6000 is about the same.

twisted raven
Online
Last seen: 13 min 42 sec ago
Joined: 03/13/2016 - 11:10
Posts: 493
Location: texas

Lumen differences don’t scale linearly with your perceived brightness of the light. It will take like 4x the lumens to achieve what looks like 2x the brightness.

What does scale linearly with perceived brightness is lux, or intensity, which is an attempt to measure what your eye sees. If light A has 3x the lux of light B, it will appear 3x brighter in the hotspot, but it won’t throw 3x farther.

EasyB
Offline
Last seen: 10 hours 38 min ago
Joined: 03/09/2016 - 15:24
Posts: 1816
Location: Ohio

twisted raven wrote:
Lumen differences don’t scale linearly with your perceived brightness of the light. It will take like 4x the lumens to achieve what looks like 2x the brightness.

What does scale linearly with perceived brightness is lux, or intensity, which is an attempt to measure what your eye sees. If light A has 3x the lux of light B, it will appear 3x brighter in the hotspot, but it won’t throw 3x farther.

Our perception of beam intensity would scale the same as lumen output. Think about turning the brightness up on a light: the lumen output and beam lux go up by the same amount. Lux is just lumen per square meter afterall.

Enderman
Enderman's picture
Offline
Last seen: 31 min 37 sec ago
Joined: 11/03/2016 - 22:42
Posts: 4021
Location: Vancouver, Canada

That’s almost a 25% difference so yeah technically you will be able to notice it.
However, differences in deflectors or beam shape also have an effect so you can’t really compare unless it’s two of the exact same light.