T8 is what is most commonly found in homes and offices etc, and the T5 is just a thinner diameter bulb, so the plasma inside is more condensed and emits more light when close up to it. T5 definitely makes for a better grow light overall than T8, but in the beginning of life, any bright light can be a bit much to adapt to and may need to be diffused. I just do that automatically anymore to be safe. If I only have the bright light, I keep it far away and use things to obstruct direct light to the young plants. Other, bigger plants make great light diffusers.
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