Ok so everybody can see the differance i just changed out my old bulbs that I know one was a 10k corallife and i am sure the other was as well (couldn't read the label) to the LSE 20k I paid 52 bucks shipped to my house for these they are the 150w 20k DE. And I must say WOW. The first pic is with the 10k and the second is with the 20ks crappy pics due to iphone but you can see the difference. ME likey