If RED rec RAW we can change temperature, does it matter shoot with 3200 or 5600K?

[Alexey Datsenko]

Tell me please, If we can change temperature for example from 5600 to 3200K and can we change it from 3200 to 5600?
For example if we shoot with 4 ARRI HMI (each for 1,2 Kwatt and 3K usd ) we shoot the scene in 5600K but can we shoot this scene with 4 ARRI tungsten 1,2 Kwatt (each for 700 usd) and with 3200K can we then in the post change the temperature from 3200 to 5600 and then the result as we shoot with $ HMI Arri? If shoot indoors? And if shoot outdoors?

 

[Gunleik Groven]

You can do that, but the result is not the same.

No problem in general with tungsten, though.

But do some exposure tests with both to see what you are happy with!

 

[Alexey Datsenko]

I am just trying to find the alternatives to expensive HMI Light especially for outdoors.

 

[Victor Lazaro]

The Sensor chip native Collot temp in 5600 daylight. When you switch to 3200 tungsten, you starve the blue channel from light and introduce extra grain in the blue channel.
Also if you shoot outdoors, you need to stay in the same ct than the already aaviliable light (with the sun up, Daylight, at night in a city, go tungsten)
Other than Kinos and LEDs, the only other solution is to filter your tungsten source.

 

[Daniel Stilling]

At this point its more about type of light then color balance.
You will not get the same punch outdoors with tungsten as you would with HMI's. And you would be mixing color temps outside with tungsten, and if not done properly, it will mess you in post, no matter what camera you use. The difference between RED Raw and other codecs is that in RR you can change afterwards at will and other codecs you need to choose the right color temp on set. Other than that you need to light and expose correctly for any camera.
Different light fixtures offer different tools for different occasions.
Chose your color temps wisely...

 

[Alexey Datsenko]

Ok it is easy to work with 5600K indoors you can just use fluorescent lighting Kinoflo or less expensive softbox but why oudoors everybody use only expensive HMI Arri for 2,5-4 Kwatt as usual for around 4-5K usd each. If the only reason is powerful light so I can get for example this two lamps for 300 usd get it together and get 2,6 Kwatt daylight 5600K for oudoors. The only problems is the spread of light but it can be resolved by fixing barndoors or something like this.

http://www.ebay.com/itm/2600W-Twin-...graphy_StudioEquipment_RL&hash=item2a1a52d243

 

[Ulf Krentz]

Alexey, as others have already mentioned, the same wattage of HMI vs tungsten does not end up in having the same amount of light. You need a lot more power with tungsten, especially if you additionally gel your lights to match daylight ct (be prepared to loose another stop or even more). We usually don´t change the CT setting of the camera but light for its native sensitivity. You can do this either by using a filter on the lens or color correcting your lamps or a combination of both. Don´t randomly mix different colors unless you want to achieve a special look like eg. blue fill-light. Don´t get me wrong, tungsten is beautiful light, it has a continous light spectrum and therefore a high CRI, usually better than anything else. It is cheap compared to HMI, does´t need an additional ballast, they just work as soon as you switch them on, no startup time, no problem to switch them off in between. On the downside they need a lot more power and create heat. CT shift is stronger than with HMIs when dimmed. Just do some testing and you´ll soon find out what will work best for you.

Cheers,

Ulf

 

[Alexey Datsenko]

Ulf, I am not talking about tungsten Light I am talking about daylight 5600K, (actually I see that more and more people work with daylight indoors). But indoors there is no any problem to work with daylight (you just need any fluorescent light). So indoors you can work with tungsten or daylight it is not expensive even KInoflo. But to work outdoors (of course you have reflectors) but if you really need powerful light you need expensive HMI but you can't use it because it is 4-5K usd for one fixture so I am talking only about daylight for outdoors for example if we take very powerful but simple fluorescent light as link above each fixture is 1,3K watt and we get together two fixtures to one stand we get 2,6 Kwatt of daylight 5600K light (for manage by this light we fix barndoors or softbox) so the question is why this Light can't be used outdoors as HMI. We have the same 5600K, the same 2,5 Kwatt. Of course you can manage HMI very well but if we fix barndoors and softbox we can manage the spread of light intensity of light not so good as with HMI but we get the light for outdoors for 300 usd and not for 3K usd as with HMI.

 

[Ulf Krentz]

Lighting is complex, you will find occasions where these lights will work well, especially if you plan to bounce the light. With a single HMI light you have a small, single light source which creates a strong, single shadow. If you use multiple lights you also get a lot of shadows. These lamps already use multiple bulbs in itself. You cannot just compare the brightness of light, there is so much more... it all depends on what look you have to achieve. While I am not a fan of fluorescent I admit they can create an interesting look. The light you were refering to will probably not be flickerfree, might be worth to add this into consideration, too.

 

[Alexey Datsenko]

Light of course it is complex, but i Think it is not good idea to buy HMI fixtures for 10K or rent it for 200 usd each (of course if it is not a commercial work) for work outdoors. I think there is another way. Firstly of course simple reflectors.

 

[Ulf Krentz]

Of course not, unless you would need it regulary and get paid for it. Please don´t feel offended, I am trying to help and share my experience. Especially outdoors you could also shape light using reflection panels or block light using cutters or overhead butterflies, extremely effective and a lot cheaper.

 

[Alexey Datsenko]

Thanks Ulf, yes I think if you have a Light (even not very well but enough powerful) you need to find the way to control it and you will get a good results, maybe just need to experiment a little)

 

[Dennis Guskov]

AFAIK CFL bulbs are not very good for the outdoor work, I believe it says that somewhere on them too, unless these are some special light bulbs. Plus be careful using those bulbs as they are made using vaporized mercury and cannot be disposed of as simply as regular bulbs in the trash. They are highly toxic if broken, for human health and the environment.

 

[Alexey Datsenko]

AFAIK CFL bulbs are not very good for the outdoor work, I believe it says that somewhere on them too, unless these are some special light bulbs. Plus be careful using those bulbs as they are made using vaporized mercury and cannot be disposed of as simply as regular bulbs in the trash. They are highly toxic if broken, for human health and the environment.

Thanks Dennis! But in every softbox (most popular light and everybody use it) there is CFL bulbs. So only reflectors outdoors? HMI is not a variant.