Cecil,

Here's what you do:

Replace all ten bulbs at the same time.

Raise the power module up 5-8 inches higher than what it is now.

Shorten you photoperiod by 30% for the first week.

After week one lower the P.M. 3-4 inches and increase the p.p. by 15%

After week two lower the P.M. to its original position and photo period.

Next step sit back and enjoy your new lights!