From the manufacturer:SUNMASTER Neutral Deluxe Grow Lamps emit balanced light similar to a 4000° Kelvin source, imitating the natural white look of sunlight. They are ideal single lamp sources for practically all phases of plant growth.SUNMASTER Green Harvest Metal Halide Lamps are effective in promoting both vegetative growth and flowering. They surpass many other HID sources in PAR watts - the most objective measurement of total light energy available for photosynthesis.
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