If you are really worried about PAR i wouldn't be, a 6 bulb t5 fixture with the right bulbs will produce more par and better coloration then your MH. I guarantee you will not need a chiller. Here is what i suggest.
ATI SUNPOWER OR POWERMODULE (HIGH END)
SUNLIGHT SUPPLY TEK ELITE (MOD END CHEAPER)
You are going to have to go with a six bulb fixture with the size of a tank. Here are the bulbs i suggets for PAR and growth.
ATI BLUE PLUS
ATI AQUA BLUE
ATI PURPLE PLUS
ATI BLUE PLUS
ATI AQUA BLUE
ATI BLUE PLUS
OR
KZ SUPERBLUE
KZ NEW GEN
KZ SUPERBLUE
KZ FIJI PURPLE
KZ CORAL LIGHT
KZ SUPERBLUE
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