Quantity   Component name
3 × 20W 110V COB LED Can be purchased from aliexpress/ebay for about $2 (search for: 110V 20W COB). Model: AC110V-6040-F2525 (A0). 20, 30, and 50W are available.
1 × Clear polycarbonate tube 2" OD 1/8" thick
1 × Aluminum plate
1 × UHMW rod 2.25" OD
1 × R3402A power switch
1 × Circular connector