Beamhead,
it's a matter of penchant. TYAJ is White with blue accent. There is TWOJ, it's more natural white. LH HA used TWO(J,K), while CFP SE LH used TYA(J,K)
(J) is slightly lower in the turn on voltage at 3.27v - 3.51v
(K) is higher at 3.51v - 3.75v