posted 8 years ago
Ok, so yes you are correct, leggy plants are a sign of low light levels, you need more light.
If you suffer from low ambient temperatures led will not offer heat! So you may need to supplement.
Blue spectrum light encourages vegative growth and will keep internode spaces close together, red spectrums really is best for flowering growth so what you really want is a dual spectrum light which encorperates both ends of the light scale.
You can get fancy by using far red spectrum light at the end of the day to mimic the suns going down, which makes plants 'sleep' faster, rest and wake up quicker but I would just stick to a dual or multi spectrum for now. Put led light very close to the canopy, without the heat you can do this, just watch out when they are very young, but they should really be under a flourecent t5 then anyway. Good luck.