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NFT system - plants lanky growth

9 years ago

Hi all,
Looking for some help on a NFT system I have made. Its an indoor system, pump running 24/7. There are two sides, one against a wall, the other against the window, both have 4 levels and drain back to one reservoir. There are flourescent (single) tubes above each row (skywhite bulbs). Some of the lettuce against the window is quite 'lanky' with large internodes. It loks to me like low light issues, but am no sure. Also the window receives about 2 hours of direct afternoon sun, and an associated steep increase in air temperature. Problems seems worse against the window where there is more natural light, this is confusing me...

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