Transmission values of Heat Shield

[derekleffew]

Another non-scientific test in my garage.

A Strand-Century 2212, with a 500W EHD lamp, dirty lenses and all, at 14'-0":

No color=75.4 F.C.; with Apollo GelShield™=61.5 F.C.; thus a transmission value of 81.6%.

I don't have any other brands to which to compare this. If anyone has any Rosco Thermashield or Super Heat Shield™, or Lee Filters #269, or GAM HeatShield99, it would be interesting to post your results.

[Kelite]

Thanks for the test Derek, we measure 80.4% transmission compared to your measurement of 81.6% light transmission.

An industry veteran has commented that plain clear gel (with NO dichroic IR or UV protection) would have a transmission level of 85%. So this extra protection within the Apollo Gel Shield does not cause the loss of more than 4-5% transmission.

Thanks again for your time and attention to this testing!

[phil000]

how are you measuring this?

We are laden with some rosco heatshield, maybe I can repeat this experiment...

[Charc]

Originally Posted by phil000

how are you measuring this?
We are laden with some rosco heatshield, maybe I can repeat this experiment...

He counted every lumen by hand.

[icewolf08]

Originally Posted by charcoaldabs

He counted every lumen by hand.

You know what, you are fired.

[Charc]

Originally Posted by icewolf08

You know what, you are fired.

Why?

Actually, interesting you note that:

From the internship today, a bad thing, and a good thing.

First, the bad thing. I was on guard duty today. I was doing the archival taping of the show, was given a wireless belt-pack, all that fun jazz. During intermission I came down to be stationed on guard duty. Basically, it's a children's show, and it's in a thrust configuration, also it's a huge blackbox, so the deck was 6" off the ground. I was tasked with making sure no-one put two feet on the set, one foot was okay though. I saw my old boss walking by, and quickly said hello, I didn't even realize he'd stepped up, until the Stage Manager and Sound Op rolled up... They're nice though, the sound op (jokingly) said: "Intern Charlie, we gave you one job, and you messed it up, haha!"

Now, the good thing. The production manager asked me what I was doing this summer. She said everyone has been saying I was fantastic, and that she'd love to have me come in over the summer to work with them in-terms of facility maintenance, electrics maintenance, and scenic construction for the first two shows of their season. (She did note that she has yet to talk to the TD and ME though.) I dunno 'bout this one though... I mean I spoke with the shakes in the park organization, who said they'd love to have me come back too, schedule is looking kinda full. So if I don't get into the Govie school, as of now, it looks like some good options. Hopefully everything will standup 'till summer.

[derekleffew]

Originally Posted by phil000

how are you measuring this?...

I'm using this light meter, but any should do. Take reading at center of beam of no color. Put heat shield in color frame. Take second reading. Change not the intensity of the fixture or location of the meter between readings. Divide the latter by the former to find transmission value.

[Charc]

Are light meters usually around 100 bucks? Seems like a nice price.

[Pie4Weebl]

Originally Posted by charcoaldabs

Are light meters usually circa 100 bucks? Seems like a nice price.

circa? Let me be the first to jump on you for using the wrong word, I am sure derek will be around shortly.

[Charc]

Originally Posted by Pie4Weebl

circa? Let me be the first to jump on you for using the wrong word, I am sure derek will be around shortly.

Haha, I don't know why I wrote circa, a little bit of disconnect between the brain and fingers, fixed, thanks.