
The best way is to connect aluminum wire to copper wire. Expensive, but it's the best way to avoid overheating and potential fire hazards. If you're making a socket, I highly recommend making them all if there are wire nuts (purple or not). You'll need a torque wrench, around $15-20, to tighten it properly.

π 50-Piece Compact Wire Connectors with Lever Nuts for Easy and Fast 4-Conductor Combination Terminal Connections - Suitable for Multiple Types, 28-12 AWG
25 Review

π WAGO 221 LEVER-NUTS 78pc Compact Splicing Wire Connector Assortment with Case: Convenient and Versatile Solution for Electrical Connections
10 Review

π WAGO 221 LEVER-NUTS 36pc Compact Wire Connector Assortment: 16x 221-412, 12x 221-413, 8x 221-415
10 Review

π΅ GKEEMARS 106 Pcs Lever Wire Nuts Connectors: Compact Splicing Kit for Electrical Wires - Solid, Stranded, and Flexible Wires (Blue)
9 Review

Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review

π‘ Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review

Wireless Electronic Ballast Interface Certified
8 Review

Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review