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JD Hartman

Member Since 04 Aug 2006
Offline Last Active Nov 14 2018 07:32 PM
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Posts I've Made

In Topic: Voltage & Wattage Question

11 November 2018 - 01:57 PM

We're having a hypothetical debate in the studio this morning around the concept of Jumbo lights (wiring 28V ACL lights in a series). We're not electrics so we won't be wiring anything ourselves but had a question about the concept.

 

Assume we have 4 x 28V/600W ACL bulbs wired in a series. We'll end up with 112V and 2400-ish Watts, which is 21.4 Amps. Not powerable by a 20 Amp household circuit.

 

Is my electrical knowledge correct, here? Thoughts? Voltage and Watts add up in a series. Then Watts divided by Voltage to get Amperage.

 

More like 2400w/120v=20a.  I don't think you're going to meter less than 120V anywhere (USA) even under load. Not even in Harlem, NYC in the Summer. A 20a breaker doesn't trip at exactly 20.001 amperes.  Why don't you try your 4 bulb ACL setup in a see how long it takes the breaker to trip. If you think you are going to run your light on the end of a 100 foot stinger, then all bets are off.


In Topic: ENG Lens possibility with an Alexa?

21 October 2018 - 08:58 AM

Instead of, "So I'm completely shooting in the dark here", maybe you can have this posting moved to the correct section of the forum?


In Topic: Lighting In Rain

13 October 2018 - 01:00 PM

What about a place in LA, just so I can use it as a reference for the places in Aus. May be called something different.

 

Here's the website of the company that makes and sells it in the USA.

http://www.warpbros....lass&product=24

Maybe they have a Aus. distributor or can give you the name of a manufacturer of a similar product.


In Topic: Lighting In Rain

13 October 2018 - 12:56 PM

For Tungsten Fresnels, we usually just let those go.  Monsoon, Hurricane, whatever.  If the Gaffer or Bests get a little worried, we will put some cello wrap over those as well, but Tungsten is nigh indestructible and hot.

 

I find the above a little humorous.....

Who is responsible for the electrical safety of cast and crew on set?

Who decides what precautions need to be taken for cable connections, distro and lighting equipment? 

Who is qualified to decide that it's not safe to continue to power and light an exterior during a rainstorm?

I'll give you a little hint, it's not the DP.


In Topic: Repairing a C-stand

12 October 2018 - 09:42 PM

Same factory in China probably makes the KUPO, Avenger and the No Name e-bay ones.

 

All Manfrotto/Avenger stands and grip gear used to be manufactured in a single town in Italy.  Sadly the bean counters won out and now it's all far east import.


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New Pro Video - New and Used Equipment

Gamma Ray Digital Inc

Willys Widgets

Media Blackout - Custom Cables and AKS

The Slider

Tai Audio

Gamma Ray Digital Inc

CineLab

Broadcast Solutions Inc

Technodolly

Rig Wheels Passport

Glidecam

Visual Products

FJS International, LLC

Abel Cine

Ritter Battery

Paralinx LLC

New Pro Video - New and Used Equipment

Wooden Camera

Aerial Filmworks

rebotnix Technologies

CineTape

Metropolis Post