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Generally that is true. Overall the warm whites are the most inefficient since they produce much light in the middle of the spectrum (green/yellow) but they also put out a little in the far red/near infra-red part of the spectrum whereas the cool whites usually don't. This is the critical part...

Like Thiaboy said lumen is not a proper way to measure the usefulness of a particular light for plant growth. Lumen is a subjective measurement of how bright a light "appears to the eye". Lumen is automatically biased toward the middle (green) portion of the light spectrum. For example, a...

A do-it yourself project is always a good idea and i greatly respect anyone who has the knowledge and willingness to make any project more self-reliant! As a religious conviction i seek to find and relay any information that will enable people to accomplish their personal sacrament provisions...