These are NOT exhaustive lists -- they are just a few of the strongest lines visible to human eyes. The units of wavelength are nanometers. The "strength" values are just rough guidelines to suggest which lines might be the strongest within each element. They certainly do NOT indicate relative strengths from one element to the next.
Element Wavelength Strength ------------------------------------------------------- Hydrogen 410 15 434 30 486 80 656 300 Helium 397 20 403 55 412 14 447 200 502 100 588 600 668 100 707 200 Mercury 405 1800 436 2000 546 1100 577 1240 579 1380 Neon 439 200 585 500 598 120 616 120 618 250 622 150 627 150 638 120 640 200 651 150 660 150 Oxygen 407 735 419 735 533 485 544 335 596 350 605 470 616 1340 645 1080 -------------------------------------------------------