I wouldn't see why not. T4 is rated at 1225 @ 3ft and the scwd is recommended for 1200 or less. Just use a ball valve is your worried and tone it down. I use a mag 12 but I am looking for a T4 to run with my scwd. Mag is too noisy.
I have a 400w PFO HQI ballast and mini pendant for sale. It's less than a year old and comes with a 400w hamilton 10k bulb that is about 3 months old and 2x 28w pc actinics with fan built in the end. $250 or best offer. I also have an AB 10k 400w bulb that was used less than a month. $60. Email...
You don't count the drops that it takes. You have to read what it says on the 1 ml syringe after it changes color. Be sure to hold it upside down when taking the reading. After you take the reading look at your chart that comes with the kit and you will know what your alk is. HTH