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Mine Exploration Forum

Author Lux, Lumens, bla bla explained
Mr Mike

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Joined: 09/06/2007
Location: Bury - In The Laboratory

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Lux, Lumens, bla bla explained
Posted: 23/09/2010 12:37:59
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I came across this site which gives details about light output, the lamp builders may find it useful...

[web link]

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Mr Mike www.mineexplorer.org.uk
IP: 79.70.90.28
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Lux, Lumens, bla bla explained
Posted: 23/09/2010 13:45:47
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Good on you Mike.

My advice still stands about seeing a lamp perform underground before making a purchase. A lot of peole will look at this, understand it, but fail to see how it indicates the actual performance of a lamp.

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''the stopes soared beyond the range of our caplamps' - David Bick...... How times change
IP: 84.13.96.36
Mr Mike

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Joined: 09/06/2007
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Lux, Lumens, bla bla explained
Posted: 23/09/2010 13:52:32
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Absolutely right Roy

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Mr Mike www.mineexplorer.org.uk
IP: 79.70.90.28
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Lux, Lumens, bla bla explained
Posted: 23/09/2010 14:22:55
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Thank you, that's nice and concise.

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Hé ! Ki kapcsolva le a villanyt ?
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derrickman

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Joined: 18/02/2009

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 10:05:32
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I just use the scale from 1 to 4 as previously explained. Tells you the things you actually notice.

ttxela's photos indicate that his new lamp from Roy scores about a 3.2 - ie noticeably stronger than an Oldham but a fair way short of the headlights on a HiLux.

Hilux headlights are a good measure for professional users because everyone has driven a HiLux underground at some time or other.
IP: 86.30.241.199 Edited: 24/09/2010 10:10:22 by derrickman
ttxela

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Joined: 04/09/2007
Location: Cambs

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 11:49:17
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derrickman wrote:

I just use the scale from 1 to 4 as previously explained. Tells you the things you actually notice.

ttxela's photos indicate that his new lamp from Roy scores about a 3.2 - ie noticeably stronger than an Oldham but a fair way short of the headlights on a HiLux.

Hilux headlights are a good measure for professional users because everyone has driven a HiLux underground at some time or other.


Ah, Blush I should perhaps clarify that although some of my pictures were taken with my new lamp from Roy on it's maximum setting they do not perhaps indicate accurately the brightness of it.

The picture I think you are referring to was taken with the lamp on maximum on a very short exposure (maybe 1/8 second) with no other light source and the camera flash off. My camera does tend to take rather dark pictures generally.I was rather impressed with this picture as the effect is similar to what I'd expect if using my Raptor to light the scene with a 5 or 6 second exposure.

I think Roy's comparison with 2 car headlights would be about right.

Photography is probably a particularly poor way of comparing lights.
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royfellows

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 11:53:53
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ttxela wrote:



Photography is probably a particularly poor way of comparing lights.


This is a conclusion that I have recently come to, and not on the basis of camera settings which obviously radically alter the picture.

I think that different colour temperatures also affect the picture.

Finally, again my advice stands. If possible see a lamp perform underground before making a purchase.

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''the stopes soared beyond the range of our caplamps' - David Bick...... How times change
IP: 84.13.96.36
derrickman

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Joined: 18/02/2009

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 13:35:52
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ttxela wrote:

derrickman wrote:

I just use the scale from 1 to 4 as previously explained. Tells you the things you actually notice.

ttxela's photos indicate that his new lamp from Roy scores about a 3.2 - ie noticeably stronger than an Oldham but a fair way short of the headlights on a HiLux.

Hilux headlights are a good measure for professional users because everyone has driven a HiLux underground at some time or other.


Ah, Blush I should perhaps clarify that although some of my pictures were taken with my new lamp from Roy on it's maximum setting they do not perhaps indicate accurately the brightness of it.

The picture I think you are referring to was taken with the lamp on maximum on a very short exposure (maybe 1/8 second) with no other light source and the camera flash off. My camera does tend to take rather dark pictures generally.I was rather impressed with this picture as the effect is similar to what I'd expect if using my Raptor to light the scene with a 5 or 6 second exposure.

I think Roy's comparison with 2 car headlights would be about right.

Photography is probably a particularly poor way of comparing lights.


ok let me know next time we have the chance and I will bring my HiLux and show you how it works...
IP: 86.30.241.199
royfellows

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 13:52:25
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I dont know a Hilux, so "everyone" obviously does not include me.

But the MagnumStar is easily equal to the main beam of my Skody VRS. If I go back to the car in the dark with it on full, I drive away thinking my alternator has gone or something wrong somewhere.

By the way, I do 'sensible' lamps as well

Take a look at my website www.ledcaplamps.com
The are comparison photos there between the different lamps and an Oldham.

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''the stopes soared beyond the range of our caplamps' - David Bick...... How times change
IP: 84.13.96.36
derrickman

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 17:54:34
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somehow I'm not surprised that Skodas have lights less powerful than an Oldhams lamp Laugh IP: 86.30.241.199
royfellows

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 18:27:46
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Volkswagen Audi Group, 2 litre petrol turbo, remapped to 242 BHP............................and I can still get up to 40 mpg taking it steady.

How times change Big Grin Big Grin Big Grin

EDIT
Interesting snippet from Wiki:
Although it operates worldwide, Volkswagen Group's core market is primarily Europe. Of its automobile brands, Volkswagen Passenger Cars is its mainstream marque, and the Group's major subsidiaries also include well-known car marques like SEAT, Audi, Škoda, and the prestige marques of, Lamborghini, Bentley, and Bugatti. The Group also has operations in commercial vehicles, owning Volkswagen Commercial Vehicles, along with a controlling stake in Swedish truck and diesel engine maker Scania AB, and a 29.9% stake in MAN SE.



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''the stopes soared beyond the range of our caplamps' - David Bick...... How times change
IP: 84.13.96.36 Edited: 24/09/2010 18:35:47 by royfellows
ttxela

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Lux, Lumens, bla bla explained
Posted: 24/09/2010 20:51:10
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derrickman wrote:

ttxela wrote:

derrickman wrote:

I just use the scale from 1 to 4 as previously explained. Tells you the things you actually notice.

ttxela's photos indicate that his new lamp from Roy scores about a 3.2 - ie noticeably stronger than an Oldham but a fair way short of the headlights on a HiLux.

Hilux headlights are a good measure for professional users because everyone has driven a HiLux underground at some time or other.


Ah, Blush I should perhaps clarify that although some of my pictures were taken with my new lamp from Roy on it's maximum setting they do not perhaps indicate accurately the brightness of it.

The picture I think you are referring to was taken with the lamp on maximum on a very short exposure (maybe 1/8 second) with no other light source and the camera flash off. My camera does tend to take rather dark pictures generally.I was rather impressed with this picture as the effect is similar to what I'd expect if using my Raptor to light the scene with a 5 or 6 second exposure.

I think Roy's comparison with 2 car headlights would be about right.

Photography is probably a particularly poor way of comparing lights.


ok let me know next time we have the chance and I will bring my HiLux and show you how it works...


That would be an interesting comparison, I'm very pleased with it anyhow. With the Raptor I now have two excellent lamps.

BTW I also owned a Skoda, mine was a proper one though, an Estelle 120L bought for £70 a few years back.
IP: 92.8.209.9
derrickman

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Lux, Lumens, bla bla explained
Posted: 25/09/2010 06:43:12
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yes, I remember that Skoda. I thought the Ford with the sheep skull on the front was good cavers' transport as well...

The Skoda Octavia is a common hire car these days, I had one in Germany earlier in the year. The Skoda Yeti is making a good reputation as a tough, knock-about car for the construction market, where serious overland 4x4 capability isn't really required, but you do want a car with a good load-carrying capacity and plenty of traction for driving on unsurfaced roads.

Actually the best lights I've had underground were on my old 24v Land Cruiser, rating a 5+ on the HiLux scale...
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