Anybody making 30 to 60 thousand lumen dive lights? Besides Big Blue??

[tursiops]

I'm beginning to not understand what it is you are trying to accomplish.
Do you want to see farther in the dark water, or the same distance but brighter, or see a wider-field of view at the same brightness?
These three things have different solutions.....

 

[Diving Dubai]

Diving Dubai why is that light so inefficient? 12.5 lumen/watt?

Heat is one factor There are lots of High power chips in a relatively small area

The Heat sinks are finned and almost 1" thick, and while there are fans, you can't have too many because of noise. Also remember this unit can be on location in the desert where it'll be mid 30's (C) and very high humidity. As you scale up things get a lot,lot harder

But also remember in regard of the application it is very efficient. The alternative solution would be 5kW or 10kW HMI (input power) fixture

Broadcast fixtures have different objectives, beam quality, flat fields, very high CRI/TLCI - your normal video lights won't be at 90% let alone 95-97% and most importantly consistency - in our world you need to be able to put 100 fixtures in from of a camera and not see any discernible differences.

FWIW our Gen 1 fixtures have been running in news rooms 24/7 since 2011 and we're not seeing failures of significance - more that 50,000 hrs because we're not over driving chips. I do literally mean they're switched on 24 hrs a day 7 days a week.

A consumer grade LED fixture couldn't get close because of different design philosophies and needs.

 

[tursiops]

the true 10,000 lumen video lights from UWLD are not great in black water. Far too much back scatter.

@calabash digger The key to avoiding backscatter is NOT more light, but rather getting a better angle between your line of vision and the direction of illumination. The scatter from small (think, mud) particles in the water is maximum in the 180 deg direction, that is, right back at you. Getting the light off to the side -- 45 to 90 deg -- from your viewing direction will help more than just having more light.

 

[tbone1004]

@Diving Dubai I figured it was a combo of fan power consumption and the heat generated since everything gets worse when hot. One of the perks with properly designed dive lights. The UWLD's can't run on high out of the water for very long and will kick down to low on a thermal switch.

 

[rjack321]

If you really want that powerful of a video light you can get it but you won't like the price and it won't magically make the water clear.

Keldan Video 24X FLUX 35,000 Lumen Underwater Video Light (backscatter.com)

 

[Angelo Farina]

If you really want that powerful of a video light you can get it but you won't like the price and it won't magically make the water clear.

Keldan Video 24X FLUX 35,000 Lumen Underwater Video Light (backscatter.com)

This looks as a serious product. All the data supplied are perfectly consistent. Three battery packs of 100 Wh each (300 Wh total), meaning a 360W output for 40 min, and 35000 lumens (just something less than 100 lumen/watt, which is perfectly credible).
Of course, also the price is "serious".
The point now is if one really needs such a powerful light source...

 

[Diving Dubai]

This looks as a serious product. All the data supplied are perfectly consistent. Three battery packs of 100 Wh each (300 Wh total), meaning a 360W output for 40 min, and 35000 lumens (just something less than 100 lumen/watt, which is perfectly credible).
Of course, also the price is "serious".
The point now is if one really needs such a powerful light source...

I disagree. But if they can convince people to buy it, good luck to them

Firstly they're claiming ONLY 82% CRI on a 5600K array. That's rubbish, I mean seriously rubbish. Anyone who isn't getting above 90% on either 5600K or 3200K on their units should reconsider their supply (and design)

This is 2012 array technology.

I actually do know how much arrays cost (remember all arrays are basically brought from the same few suppliers). They have advertised 35000K (how many people actually have a test bench?) Yes it's a "big" number because it's measured at the surface of the array - but it's' of no consequence

If it was, Our big light which achieves the 35000 lumens at a distance of 10m/33' away we'd instead advertise as being a 20,000,000 Lumen fixture (becuases that's the theoretical total output of the arrays measured at the surface. Inverse Square Law applies

At the subject distance of 1-2m apply the inverse square law you're down to a Theoretical 1093 lux/lumen/m2

And this is what really upsets me. Because this light won't ever achieve this output, since it has no optics. Which are incredibly important to achieve output at the required distance

I bet a significant amount that this light won't achieve anything like the output at the subject. Its output will drop off a cliff

Why do I keep banging on about subject? Because measuring the light actually at the subject distance is the only true measure.

No one quotes it, because they want a headline number and they don't want to admit how crappy their lights are by showing an actual measured output at distance.

Basically. Buyer Beware These quoted Lumen numbers are meaningless

As a comparison I can sell you 2 professional TV lights that each achieve an actual 1500 Lumen at 2m for less than the price of this dive light (I assure you ours have a lot more tech behind them).

We actually have a small battery powered unit (designed for mounting on small DSLR type cameras) that puts out more light than this and at a much cheaper price (with CRI +96%).

We could turn it into a dive light but the market is too small for us to bother

 

[tbone1004]

@Diving Dubai the optics discussion is critical and is what allows UWLD to get as much of the light captured as they do. It cost a bucket of money to design proper underwater optics, but the investment was well worth it

 

[tursiops]

I disagree. But if they can convince people to buy it, good luck to them

Firstly they're claiming ONLY 82% CRI on a 5600K array. That's rubbish, I mean seriously rubbish. Anyone who isn't getting above 90% on either 5600K or 3200K on their units should reconsider their supply (and design)

This is 2012 array technology.

I actually do know how much arrays cost (remember all arrays are basically brought from the same few suppliers). They have advertised 35000K (how many people actually have a test bench?) Yes it's a "big" number because it's measured at the surface of the array - but it's' of no consequence

If it was, Our big light which achieves the 35000 lumens at a distance of 10m/33' away we'd instead advertise as being a 20,000,000 Lumen fixture (becuases that's the theoretical total output of the arrays measured at the surface. Inverse Square Law applies

At the subject distance of 1-2m apply the inverse square law you're down to a Theoretical 1093 lux/lumen/m2

And this is what really upsets me. Because this light won't ever achieve this output, since it has no optics. Which are incredibly important to achieve output at the required distance

I bet a significant amount that this light won't achieve anything like the output at the subject. Its output will drop off a cliff

Why do I keep banging on about subject? Because measuring the light actually at the subject distance is the only true measure.

No one quotes it, because they want a headline number and they don't want to admit how crappy their lights are by showing an actual measured output at distance.

Basically. Buyer Beware These quoted Lumen numbers are meaningless

As a comparison I can sell you 2 professional TV lights that each achieve an actual 1500 Lumen at 2m for less than the price of this dive light (I assure you ours have a lot more tech behind them).

We actually have a small battery powered unit (designed for mounting on small DSLR type cameras) that puts out more light than this and at a much cheaper price (with CRI +96%).

We could turn it into a dive light but the market is too small for us to bother

Your comparison of prices is specious unless you factor in the MAJOR cost of having your lights function underwater.

 

[Diving Dubai]

Your comparison of prices is specious unless you factor in the MAJOR cost of having your lights function underwater.

Not a MAJOR cost to make them work underwater at all. Simple housing, couple of O rings and a magnetic /piezo switch, for a battery powered light

I know this because we build some of our products to be used in tanks for underwater sets. Although ours are powered by 240V making it slightly more complex. Since no-one's been electrocuted I think I know what I'm talking about on this subject