Cateye HL-EL500 mod, which Seoul P4 to use?

[Helius]

taking inspiration from here
http://www.candlepowerforums.com/vb/showthread.php?t=167551

I have managed to crack open my HL-EL500. I am about to place an order for a Seoul P4 but wondered what type of whiteness I should get; White, Pure White or Warm White?

Any opinions?

 

[Szemhazai]

These that will give you more lumens .

More important is that you should use U_ _ _ H - with lower Vf.