You must cut by hand with a vise and hacksaw. I won't share with you what happened when I tried the cutoff saw because DIYers have a bad reputation anyway.
Zulkit Junction Box ABS Plastic Waterproof IP65 Electrical Boxes Hinged Shell Outdoor Universal Project Enclosure With Mounting Plate And Wall Brackets Grey 11.8X7.9X6.3 Inch(300X200X160Mm)
10 Review
Junction Box, Zulkit Project Box IP65 Waterproof Dustproof ABS Plastic Electrical Boxes Electronic Enclosure Black 4.5 X 3.5 X 2.2 Inch(115 X 90 X 55 Mm)(Pack Of 1)
12 Review
Zulkit Waterproof Plastic Project Box ABS IP65 Electrical Junction Box Enclosure Black 6.22 X 3.54 X 2.36 Inch (158 X 90 X 60Mm)
12 Review
Protect Your Electronics With Zulkit'S Blue Metal Enclosure: DIY Project Case With Preventive Features (9.1" X 7.3" X 3.9")
13 Review
π‘ High-Quality Advance ICN-4P32-SC Electronic Fluorescent Ballast: Ideal for 4 Lamps, 32W T8, 120/277V
3 Review
π Robertson 2P20132 Quik-Pak: 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A (Crosses to RSW240T12120 /B)
4 Review
Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review
π‘ Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review