I think in regards to the radiums, the galaxy will run at about 270-275 which is what they are rated at. So you are not underdriving them like with the icecap or overdriving them with the HQI and you get a longer life on them. On the vho and t5 set up, I dont use any at all. I use to run them when I had the the hqi but stoped about 6months
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