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get you one of those, tells you the RH and temp and wasnt very much money.
You could wire a vanity bar, That gives you four bulbs, get the largest actual watt bulbs you can. The tubes are good for seedling, but not powerful enough for flowering. you have to use two different bulbs when using bag seed. 6500k for veg and 2700k for flowering.
get a pack of bulbs from walmart, the 28 watts actual 100 watt equivalent will work. Get the 6500k bulbs for veg. for flowering get 2700k bulbs, max watts. Get at least three bulbs on them as soon as you have a full set of true leaves.
The more light you have, the better the results will be.
JP