Reddit reviews ExpoImaging ROGUEGELS-U Rogue Photographic Design Rogue Gels Universal Lighting Filter Kit

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https://www.amazon.com/ExpoImaging-ROGUEGELS-U-Rogue-Photographic-Design/dp/B005KEL4NI/ref=sr_1_1?ie=UTF8&qid=1480365008&sr=8-1&keywords=rogue+flash+filters

https://www.amazon.com/Rogue-Photographic-Design-ROGUEGEL-CC-Correction/dp/B00A8EIPGY/ref=sr_1_2?ie=UTF8&qid=1480365008&sr=8-2&keywords=rogue+flash+filters

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If you shoot in RAW you can edit the white balance in post. If you are using flash and are in a tungsten room and want to match, take a look at gels to add to your flash to get it closer to the room light - ExpoImaging ROGUEGELS-U Rogue Photographic Design Rogue Gels Universal Lighting Filter Kit https://www.amazon.com/dp/B005KEL4NI/ref=cm_sw_r_cp_api_i_vZC1CbEDBXP1H

This kit also includes fx colors if you use off camera speed lights and want to color a scene differently or add accent colors for hair lights.

Magbox is not worth it... And as far as gels, with the round head kit, it comes with the clear holders, https://www.amazon.com/ExpoImaging-ROGUEGELS-G-Rogue-Photographic-Design/dp/B005KEL4BU work amazing with it... or you can use the bare bulb and https://flashgels.com/index.php?route=product/category&path=61

or the speedlight head with https://www.amazon.com/ExpoImaging-ROGUEGELS-U-Rogue-Photographic-Design/dp/B005KEL4NI

Nope just gelled the flash. I used something like this.

https://www.amazon.com/ExpoImaging-ROGUEGELS-U-Rogue-Photographic-Design/dp/B005KEL4NI

Gels - https://www.amazon.com/ExpoImaging-ROGUEGELS-U-Rogue-Photographic-Design/dp/B005KEL4NI - are just some plastic color filters for flashes

Flashes generally provide more light and/or have longer reach. I can't really imagine setting up a LED somewhere or even using one of the on-camera panels and photographing people. You would either have to be really close or have expensive lights. Check out strobist if you're curious about lighting

Color filters are mainly for BW film. They can also block out a lot of light (3-4 stops for a red #29). With digital cameras, you can change the luminance of a color channel while converting the image to black and white without losing light or dealing with filters.
I shoot a bit of BW film as well, and that's really the only use case.

As the other commenters mentioned, it should really depend on the situation and you should be making these kinds of decisions on a case-by-case basis. 4 speedlights in the corners could potentially work, but it would depend on the room. Additionally, you want to think about the type of light you are creating - do you want to point everything at the ceiling and have light everywhere, or do you want to have a kicker or two to shoot into to create some depth to the images?

If you only have one speedlight, on-camera bounce can provide decent results. However, if you're going to add additional off-camera units, my advice would be to invest in flashes with triggers/tranceivers built into them, such as the Yongnuo YN-560 IV line. They're incredibly cheap, reliable, and work perfectly for this sort of application. By doing this, you'll be able to trigger the flashes remotely (and reliably), with the additional benefit of being able to balance your output with the ambient light in the room, so as not to completely overwhelm it. Your batteries might have to be replaced once every 2-3 hours, depending on how bright your flash is set to. Buy some rechargeable batteries. You'll save hundreds.

My personal preference is to use a master flash on the top of my camera to light my subjects, and use it to control other off-camera radio slave units for additional fill or edge lighting (kickers) as the need arises. You get the flexibility of on-camera bounce with the look of multiple off-camera lights. It's the best of both worlds, I think.

Also, to your question about the light temperature, bare flash will show up as blue light in an image where the white balance is set to match most ambient indoor lighting, which is far warmer (usually tungsten). This will definitely create some weird-looking shots. You can easily get around this by gelling the flashes to the ambient light in the room, and I would definitely recommend it, no matter what lighting setup you go with. Just pick up a couple of gel kits off Amazon that include some CTO (orange) gels, and you'll be golden. In terms of bang for your buck, this will be the most effective way to improve the look of indoor images shot with speedlights.

Good luck with your shoot!