I have 2 23 watt flouro tubes HPS came in today im 5 weeks in veg can I switch to HPS while vegg or do I have to wait till flowering

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5 weeks vegg? 26 watt. you need more lite and yes you can use a hps, make sure you have a fan blowing inbertween the top the plants, and the lite, blowing out to help make the plants stronger and to help cool down the lite. be carfull when you first change to hps. keep a good eye on it for a day or 2 when you swap lites, so they dont burn your plants. try to get the lite i foot away if you can, when the plants get used to the lite.