Thread: T5 grow light
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Old 03-16-18, 08:24 PM   #5
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I looked into Ag News , the videos would not play on my laptop anyways.

Watt for watt the cool white tubes have more usable light then warm white.
If it was me I would stick with cool white tubes for starting as red light / warm white works more effectively for fruiting / flowering. Experienced gardeners mix common warm white and cool white tubes they do not invest in fancy bulbs.
Cool white bulbs blue has a bigger effect then warm whites red does on vegetating plants.The way it works out cool and warm white together are great for plants. Blue is just better for the growth stage. They both have enough PAR light frequencies for the plants do well a better option is pick and choose light temperature for the stage of growth the plants are in. All cool white for vegetative stage and add in all or 50/50 warm white when you want to help the plants set fruit or flowers etc.

Its the penetration / reach that they lack. Great for starting plants

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