Led lux

[Greg_Vic_Diver]

975 lumens, 12 degree angle.

Thanks,
Kathleen

Kathleen,

Can you please post how DiveRite knows there are 975 lumens as you stated? How did you test this in your design? Did you test your design?

Inquiring minds would like to know, as Engineering judgement says the light has only about 500 lumens (on a good day).

Thank you.

 

[Greg_Vic_Diver]

Actually her answer was pretty good.


A "lux" is a lumen per square meter (so the name of the light implies 1000 lumens per square meter.) Since it puts out 975 lumens, you get 975 lumens of illumination in a 1 meter circle at about 17.3 ft (minus what ever got absorbed by the water).
.

Your analysis is not correct if the assumption on total lumen output is incorrect.

 

[Greg_Vic_Diver]

Kathleen,

Can you please post how DiveRite knows there are 975 lumens as you stated? How did you test this in your design? Did you test your design?

Inquiring minds would like to know, as Engineering judgement says the light has only about 500 lumens (on a good day).

Thank you.

Hi Kathleen,

I noticed that you had responded to some other questions today. Could you please address this one?

 

[Dive Rite]

Hi Greg,

Sorry I haven't responded; I don't have the answer for you myself and am waiting to get the test parameters from our engineers. Can you educate me a bit on what your testing procedure is and how you are deriving 500 lumens? That would be helpful.

Thanks for the post,
Kathleen

 

[Greg_Vic_Diver]

Hi Greg,

Sorry I haven't responded; I don't have the answer for you myself and am waiting to get the test parameters from our engineers. Can you educate me a bit on what your testing procedure is and how you are deriving 500 lumens? That would be helpful.

Thanks for the post,
Kathleen

Right now it is based on the light sources themselves. I have access to an optical test tunnel and can run actual tests, but there is no need with this type of info:

I have seen a dissasmbled light and this is how I know what is inside.

Luxeon K2 LEDs will output about 190 lumens when driven by 722mA. There are 3 operating in series @10.2V (we hooked up a ammeter to see what current was going to the LEDs). The battery current was measured to be 0.66A @ 12.8V
Datasheet: http://www.philipslumileds.com/pdfs/DS60.pdf

When you do the math and assume a very good optical efficiency of 0.9 (which it won't be) you get 3*190*0.9 = 513 lumens

 

[gcbryan]

Kathleen,shouldn't this info be corrected on your product spec sheets? Since no matter what optics you use the total lumens can't be greater than the leds can emit and therefore it couldn't be more than 570 lumens (just based on the physics involved).

 

[Packhorse]

Hi Greg,

Sorry I haven't responded; I don't have the answer for you myself and am waiting to get the test parameters from our engineers. Can you educate me a bit on what your testing procedure is and how you are deriving 500 lumens? That would be helpful.

Thanks for the post,
Kathleen

Any feed back from the engineers on this yet?

Knowning a little ( not alot) about LED's G_V_D's math looks pretty accurate if they are indeed K2 LED's and driven at less than 1500ma each ( which still wouldnt hit the 975 lumen mark and greatly reduce the run time).

 

[Dive Rite]

Kathleen,shouldn't this info be corrected on your product spec sheets? Since no matter what optics you use the total lumens can't be greater than the leds can emit and therefore it couldn't be more than 570 lumens (just based on the physics involved).

We'll post some additional spec information on our website that will include system lumens. Will post in this forum as soon as the data is live.

 

[Dive Rite]

The LED LUX technical specifications have been updated on the web.

SCUBA Diving Equipment for Technical, Wreck and Cave Diving: Dive Rite, Inc - Product Catalog - LED LUX Canister Light

 

[eliminator]

+1 for the update. So, abit off topic, any idea how many lumens my LED700 canister light would have (the version previous to the LUX?)