I’m not sure if it’s an architectural standard for hotel conference areas but it seems most Marriott Hotels in the area use a very low color temperature lighting system. It’s probably energy efficient but it makes it difficult to get a good color balance when the lights are so dim and particularly in some configurations where there is no stage lighting. The last conference I covered the lighting was registering below 2400K – out of range for manual settings in camera that bottom out at 2400-2500K. I’ve been using CTO gels on my flashes and tried various sticky brands and velcro brands and several other options. I finally decided to try making some of my own from CTO gel sheets ( 1/4 and 1/2 CTO stock). I figured I could stack combinations to bring my lights into the proper color range. The last conference worked best at a full CTO which I achieved by stacking 2 of my 1/2 CTO gel cutouts.
I like using a Lumiquest Softbox diffuser. It has a cutout in the lower half to allow the infrared focus assist to pass.
Gel materials are available at a local theatrical lighting supply house so I purchased several sheets of 1/4 CTO and 1/2 CTO gels. I laid out the pattern from the diffuser in it’s folded state then cut a number of pieces of each density.For use with other modifiers and diffusers I cut strips the wide of the flash which could easily be secured with a Velcro strap used for a variety of other attachments such as larger soft boxes and grids.
The gel strips can also be stacked and modifiers placed over the top. Using these options allows a range of control over color temperature so that all sources are matched. The sample below was shot with 3 flash units color matched to ambient lighting.