comparision of LED, Tungsten & HMI at
DV Info Net

Go Back   DV Info Net > The Tools of DV and HD Production > Photon Management

Photon Management
Shine an ever-loving light on you.

Thread Tools Search this Thread
Old October 30th, 2022, 08:24 PM   #1
Join Date: Dec 2006
Location: Central Coast - NSW, Australia
Posts: 1,606
comparision of LED, Tungsten & HMI

I've been using a variety of LED lights for some time now and recently came across a DP that was still using Tungsten & HMI (small regional TV station) I had no way of equating my lights with his.

for instance - to match a 1k tungsten I'd need to either gel my Aputure 120 with CTO and then measure the output or gel the tungsten with CTB and do the same.

I'm wondering if anyone has done this.

with that information I can say my Forza 300 is equivalent to a 2k tungsten with full CTB or a 500w HMI - I have no idea if that's the case or not but I'd like to know.

If I'm doing this myself I'll need to hunt someone down with a 1k tungsten and run through all the lights I have to compare output.
Cheers - Paul M.
Paul Mailath is offline   Reply With Quote
Old October 31st, 2022, 02:33 AM   #2
Inner Circle
Join Date: Nov 2005
Location: Lowestoft - UK
Posts: 3,990
Re: comparision of LED, Tungsten & HMI

The thing it took me a long time to realise was that LED is not a replacement, unit for unit. I tried to add in an LED version of what I had and I hated the result. Making LED the same CT as tungsten failed, no matter if I adjusted the tungsten or the LED with gel. When I got to a new studio space I discovered that once I picked the right LED fixture for its purpose, put them in the right place at the right brightness the result was great. However, it meant that the 1K I’d have used as a key, is now a much smaller LED, the soft light’s job is being done by bigger Fresnel, and the LED panels I have are like the ancient floods I used to use for backgrounds and even, wide light. I have a ‘look’ that is similar to the old one, but created very differently. CT appears to be best set on the cameras between tungsten and LED around 4200K. Here colours seem correct on the monitors. Mixing in any tungsten source looks really strange no matter what I hang on the front. Wrong colour and wrong beam quality. I don’t know why the beams make such a difference, but the Fresnel lens lovely beam quality is missing, and if it’s gone, you need to recreate it with different kit. That was a shock. I tried simply swapping like for like and it was disappointing.
Paul R Johnson is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

B&H Photo Video
(866) 521-7381
New York, NY USA

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Photon Management

Thread Tools Search this Thread
Search this Thread:

Advanced Search


All times are GMT -6. The time now is 04:02 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2021 The Digital Video Information Network