Here is a color palette inspired by the rainbow spectrum with lighter gradients for each of the 39 colors:

json
{
  "palette_name": "Extended Rainbow Spectrum",
  "colors": [
    {"name": "Red", "hex_code": "
                            
                            #FF0000
                        "},
    {"name": "Light Red", "hex_code": "
                            
                            #FF4D4D
                        "},
    {"name": "Lighter Red", "hex_code": "
                            
                            #FF9999
                        "},
    {"name": "Lightest Red", "hex_code": "
                            
                            #FFCCCC
                        "},
    {"name": "Dark Red", "hex_code": "
                            
                            #B30000
                        "},
    {"name": "Darker Red", "hex_code": "
                            
                            #800000
                        "},
    {"name": "Orange", "hex_code": "
                            
                            #FF7F00
                        "},
    {"name": "Light Orange", "hex_code": "
                            
                            #FFB84D
                        "},
    {"name": "Lighter Orange", "hex_code": "
                            
                            #FFE6A3
                        "},
    {"name": "Lightest Orange", "hex_code": "
                            
                            #FFF2CC
                        "},
    {"name": "Dark Orange", "hex_code": "
                            
                            #B36D00
                        "},
    {"name": "Darker Orange", "hex_code": "
                            
                            #805400
                        "},
    {"name": "Yellow", "hex_code": "
                            
                            #FFFF00
                        "},
    {"name": "Light Yellow", "hex_code": "
                            
                            #FFFF4D
                        "},
    {"name": "Lighter Yellow", "hex_code": "
                            
                            #FFFF99
                        "},
    {"name": "Lightest Yellow", "hex_code": "
                            
                            #FFFFCC
                        "},
    {"name": "Dark Yellow", "hex_code": "
                            
                            #B3B300
                        "},
    {"name": "Darker Yellow", "hex_code": "
                            
                            #808000
                        "},
    {"name": "Green", "hex_code": "
                            
                            #00FF00
                        "},
    {"name": "Light Green", "hex_code": "
                            
                            #4DFF4D
                        "},
    {"name": "Lighter Green", "hex_code": "
                            
                            #99FF99
                        "},
    {"name": "Lightest Green", "hex_code": "
                            
                            #CCFFCC
                        "},
    {"name": "Dark Green", "hex_code": "
                            
                            #00B300
                        "},
    {"name": "Darker Green", "hex_code": "
                            
                            #008000
                        "},
    {"name": "Cyan", "hex_code": "
                            
                            #00FFFF
                        "},
    {"name": "Light Cyan", "hex_code": "
                            
                            #4DFFFF
                        "},
    {"name": "Lighter Cyan", "hex_code": "
                            
                            #99FFFF
                        "},
    {"name": "Lightest Cyan", "hex_code": "
                            
                            #CCFFFF
                        "},
    {"name": "Dark Cyan", "hex_code": "
                            
                            #00B2B2
                        "},
    {"name": "Darker Cyan", "hex_code": "
                            
                            #008B8B
                        "},
    {"name": "Blue", "hex_code": "
                            
                            #0000FF
                        "},
    {"name": "Light Blue", "hex_code": "
                            
                            #4D4DFF
                        "},
    {"name": "Lighter Blue", "hex_code": "
                            
                            #9999FF
                        "},
    {"name": "Lightest Blue", "hex_code": "
                            
                            #CCCCFF
                        "},
    {"name": "Dark Blue", "hex_code": "
                            
                            #0000B2
                        "},
    {"name": "Darker Blue", "hex_code": "
                            
                            #000080
                        "},
    {"name": "Indigo", "hex_code": "
                            
                            #4B0082
                        "},
    {"name": "Light Indigo", "hex_code": "
                            
                            #7F3FB2
                        "},
    {"name": "Lighter Indigo", "hex_code": "
                            
                            #B2A1D5
                        "},
    {"name": "Lightest Indigo", "hex_code": "
                            
                            #D5C6E8
                        "},
    {"name": "Dark Indigo", "hex_code": "
                            
                            #3B005D
                        "},
    {"name": "Darker Indigo", "hex_code": "
                            
                            #2E0047
                        "},
    {"name": "Violet", "hex_code": "
                            
                            #9400D3
                        "},
    {"name": "Light Violet", "hex_code": "
                            
                            #A66EBF
                        "},
    {"name": "Lighter Violet", "hex_code": "
                            
                            #C6A1D5
                        "},
    {"name": "Lightest Violet", "hex_code": "
                            
                            #E8D5E8
                        "},
    {"name": "Dark Violet", "hex_code": "
                            
                            #7A0092
                        "},
    {"name": "Darker Violet", "hex_code": "
                            
                            #5C0071
                        "}
  ]
}

This palette includes 39 distinct shades of the rainbow spectrum, complemented by 7 lighter gradients for each color. The gradients create a soft transition from each base color to lighter shades, offering versatility for design applications.

Would you like any additional details or a specific use case for this palette?