(written from a Production point of view)
Global Effects, Inc. is a special effects company specialized in creating props and FX costumes for film and television. It was formerly known as Diligent Dwarves Effects Lab and founded by Christopher Gilman and his brother Kerry Gilman as a prop rental service in 1986. The company is located at 7115 Laurel Canyon Blvd., North Hollywood, California 91605.
For Star Trek, the company created the cool suits for Star Trek V: The Final Frontier, wardrobe for Star Trek VI: The Undiscovered Country, the Knight in armor costume for the Star Trek: The Next Generation seventh season episode "Emergence" in 1994 which was worn by Christopher Gilman in this episode,  and the environmental suits in Star Trek: First Contact and in the following Star Trek: Voyager episodes.  
Among the productions the company created props and FX costumes for are music videos for Madonna ("Cherish"), Iggy Pop ("Beside You"), and Ice Cube, television series such as Earth 2, Viper, Stargate SG-1, Seven Days, Lois & Clark: The New Adventures of Superman, The Flash, SeaQuest DSV, Mighty Morphin Power Rangers, 24, Charmed, and Bones, and feature films such as Darkman, Mom and Dad Save the World, Mortal Kombat, The Addams Family, Batman Returns, Batman Forever, The Bodyguard, Masters of the Universe, Barb Wire, Forrest Gump, Bram Stoker's Dracula, Stargate, Mars Attacks, The Rock, Sphere, Deep Impact, The Core, Star Wars: Episode I: The Phantom Menace, 300, and Space Cowboys.
The company also built space suits for the NASA.  More recently, the company created props and weapons for the short film The Knightswood (2012).