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Crop

Stage

Spectrum

Leafy greens Germination/ Propagation

 

PPB or PKB as Blue promotes root creation. If you want to maximize your electrical efficacy (µmol/j), your choice is PPB. PKB will be more comfortable to the workers’ eyes.

Leafy greens Reproductive

 

PPR or PKR as red promotes biomass and flowering. If you want to maximize your electrical efficacy (µmol/j), your choice is PPB. PKB will be more comfortable to the workers’ eyes.

 

Cannabis Propagation

 

PPB or PKB because more Blue tends to keep the crop in a vegetative state and shorter in size. 

Cannabis Flowering

 

PKR because cannabis secondary metabolite seems to be stimulated by the green portion of light while the low blue to red ratio seems to promote flowering in biomass development.

Ornamentals/ Flowers

 

PPB or PKB will work well and allow growers to reduce plant growth regulators.

Microgreens

 

Any spectrum will work, but high blue will keep the seedlings from stretching.  

Strawberry 

 

PKR is very safe for all berry crops.  Intensity will be most important.

Vine crops/ Supplemental lighting

 

PPR for supplemental lighting in the greenhouse. Academic studies (University of Arizona & Michigan) tend to agree that the best spectrum for greenhouse lighting is the most efficient one in efficacy thus higher micromols/joule should be considered. Tomatoes: PPR – Bell Peppers: PKB (Harrow research center) – Cucumber should be PKR.  If in doubt choose PKR.  It will work in every situation.

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