Most folks don't seem to know the difference between adapters and transformer/converters (but that would be a different discussion). These were priced right and great for going to Norway, Denmark, Netherlands, Germany and Switzerland. Glad I found them.
Waterproof ABS Electrical Junction Box Enclosure With IP65 Rating - Black 7.87 X 4.72 X 2.95 Inch (200 X 120 X 75Mm) By Zulkit
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
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 5Pcs Black ABS Plastic Project Boxes - Ideal For Electrical And Power Junctions (80 X 50 X 21 Mm)
10 Review
Wireless Electronic Ballast Interface Certified
8 Review
Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review
💡 Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review
💡 High-Quality Advance ICN-4P32-SC Electronic Fluorescent Ballast: Ideal for 4 Lamps, 32W T8, 120/277V
3 Review