[MCSLABS]

Anyone ever give any thought to filtering what light you have to reduce unwanted green area peaks ? Or alter the spectrum to match your needs. Understandably you will need an abundance of light in order for this to be effective.

Colour Information and Spectral Charts for LEE Lighting Filters

 

[Hoppy]

Theatrical lighting uses a huge variety of filters to adjust the spectrum of the light. An excellent source of those filters is Roscolux - rosco.com This is a complicated subject, to say the least.

 

[MCSLABS]

Complicated but doable I think. Source light is important.

 

[theatermusic87]

I'm not sure if they are still free... but back in the day you could get swatch books of gel samples from rosco... They would be a 1 inch by 3 inch or so piece that had the color number on them as well as spectral information. You fan the booklet open and try out the various colors to try the various colors. If you're not solely interested in color, there were also some neutral density type filters and diffuser gels as well (basically uniformly spun fire retardant fabric) Keep in mind those are designed to work with theatrical lights which are incandescent (usually) halogen.

If you have flourescent lights you are trying to correct there were also filter tubes that slide over the bulb in tube style flourescents, avaiable in t5, t8 and t12 options

 

[MCSLABS]

I'm not sure if they are still free... but back in the day you could get swatch books of gel samples from rosco... They would be a 1 inch by 3 inch or so piece that had the color number on them as well as spectral information. You fan the booklet open and try out the various colors to try the various colors. If you're not solely interested in color, there were also some neutral density type filters and diffuser gels as well (basically uniformly spun fire retardant fabric) Keep in mind those are designed to work with theatrical lights which are incandescent (usually) halogen.

If you have flourescent lights you are trying to correct there were also filter tubes that slide over the bulb in tube style flourescents, avaiable in t5, t8 and t12 options

I may look into this a bit further, see what it would cost to make a plate, 10 x 29 " I got a lot of light, a huge green peak I would like to knock down a bit. Back to reading about PAR first to see what would be best.

This is the one that interests me right now.

 

[jeffkrol]

any magenta filters will do.. You can get a graduated set . Look for old Kodak CC or CP (color printing) filters on the eek bay..
For ref. see pg8:
http://www.tiffen.com/Kodak Professional Accessories catalog.pdf
http://www.rosco.com/spectrum/index.php/2016/04/how-subtractive-color-mixing-works/
any large CC/CP filter in Magenta will cut green

Magenta filter:

 

[MCSLABS]

We have a local supplier here in town that does filters for filming movies. They have this one in stock, $10 for a piece big enough to cover my light hood.

https://www.rosco.com/filters/SED.c...&imageName=../images/filters/cinegel/3314.jpg

How much advantage am I going to acquire by reducing the yellow green spectrum ?

 

[jeffkrol]

We have a local supplier here in town that does filters for filming movies. They have this one in stock, $10 for a piece big enough to cover my light hood.

https://www.rosco.com/filters/SED.c...&imageName=../images/filters/cinegel/3314.jpg

How much advantage am I going to acquire by reducing the yellow green spectrum ?

Advantage for what? It is just a viewing tone..
That one they have has a slight dip in the blue as well so more of a red boost filter.

More choices..

 

[MCSLABS]

The only advantage would be to reduce the spectrum to reduce the growth of BBA, I don't have BBA problem, I got a green algae problem. It uses the same light as that of the plants.