I read through the light info page, Here but still have a question about which light, an hps or MH, that specific plants prefer.

Currently I am using 400w t5 jump starter light to grow my Kale. This system is only 3 weeks old at this point. I am looking to upgrade to a better light system, and found one for sale used locally. It's an apollo 1000w system. I have read where it's not advisable to use the dimmer function on this ballast as the lights don't work right when you do.

My questions are, given as lettuce type plants are low light, if I am growing Romaine, spinach, and kale, will a 1000w burn them? Second, given as MH, and HPS each favor one end of the spectrum, which end does lettuce prefer? Red or blue?