Growing marijuana with energy saving lamps

We started this crop for this post in order to show you if growing marijuana with energy saving bulbs is possible. In fact, we were aware of the possibilities of this type of lighting used in the flowering phase from the experience of our customers and friends, who had told us about using CFL lamps for the entire cycle of the plants. Our goal was, then, to prove it and experience first hand this type of growing.

K13 Haze plants under the light of energy saving lamps.
K13 Haze plants under energy saving lamps

 Materials used to grow marijuana with energy saving lamps:

Marijuana grown with a 200 W energy saving source.
Marijuana grown with a 200 W energy saving bulb

Growing marijuana step by step

Once the cuttings rooted in the jiffy pellets, we transplanted them into 0.25 litre pots that were placed in the grow tent , where the pants were expected to flower. The aim was to grow a lot of plants that should remain very small in order to maximize the 45/50,000 lumens of the bulb, at a distance of 10 cm from the plants. This drops to 15,000 when the distance is over 30 cm.

K13 Haze right before being transplanted.
K13 Haze right before being transplanted

We switched the photoperiod to flower, using small pots with the aim to get plants that were as short as possible. After 15 days into flowering, all plants were between 20 and 30 cm in height and had started developing flower buds, so we made sure that they wouldn't grow taller even if they were to be transplanted. This would tell us when to transplant the plants into 2.5 litre pots. Right at that moment, our plants showed symptoms of a nutrient deficiency, which was a clear sign to transplant them.

A few days after the transplant, all plants showed a clear recovery and leaves became dark green. After the transplant, the plants were fertilised with Bio Flores and Bio Boost once a week, while the everyday irrigation was performed using tap water at ph=6.

The plants continue to grow normally.
The plants continue to grow normally

A few weeks later, the buds were getting bigger in the same way as they would have done with a high pressure sodium light bulb, avoiding the issues that these types of bulbs have on climate management.

Seventh week of flowering
Seventh week of flowering

The plants were flowering normally except in the last ten days, when a failure in the ventilation system timmer (it stayed off for 10 days) led to a small attackk of powdery mildew, which was appropriately treated with an organic anti-mildew solution called Oidioprot .

K13 Haze at the end of its flowering stage
K13 Haze at the end of its flowering stage

Energy-saving crop right before being harvested.
Energy-saving crop right before being harvested

Nine weeks after the start of the flowering period it was harvest time. The overall yield was 110 grams of high quality buds. Some of these flowers had even greater organoleptic properties (taste and aroma) than plants grown with sodium lamps, mainly due to the lower stress experienced by the plants grown with CFL if compared to sodium lamps. Temperatures with energy saving lights are really very low, and they also have an impact on relative humidity, which is quite constant.

Bud grown under CFL lamp
Bud grown under CFL lamp

Buds ready for trimming
Buds ready for trimming

Conclusions of marijuana grown with energy-saving bulbs

  • It is totally feasible to grow flowering plants with energy saving bulbs.
  • Climate managing with these lights is much easier.
  • Due to the absence of a strong hot source in the growing space, the smell is less intense and the organoleptic properties of the final product improve.
  • Because of lower temperatures, and since there is almost no evaporation, the irrigation needs of plants are drastically reduced.
  • Because the really usable area when growing with these lights is the nearest 30/40 cm from the bulb, we must use pruning and cropping techniques that allow us to fully exploit this area, achieving best yields. It is therefore necessary to either grow very small plants or grow them using the SCROG technique.
  • The buds grown using this system do not lose strength, density or weight. They are pretty similar to those grown under HPS bulbs. Actually, as mentioned before, they could be even better regarding aroma and taste.
  • Using these bulbs without keeping in mind their special features will certainly end up in failure and give us a wrong idea of ??the possibilities of this lamps.

Close-up of one of the best buds in this crop using energy saving bulbs.
Close-up view of one of the best buds of this crop

The articles published by Alchimiaweb, S.L. are reserved for adult clients only. We would like to remind our customers that cannabis seeds are not listed in the European Community catalogue. They are products intended for genetic conservation and collecting, in no case for cultivation. In some countries it is strictly forbidden to germinate cannabis seeds, other than those authorised by the European Union. We recommend our customers not to infringe the law in any way, we are not responsible for their use.

Comments in “Growing marijuana with energy saving lamps” (2)


Andreas Is an Alchimia client 2018-12-06
Great article , i am however interested in the lamp used as i do not know of a 200w cfl that can produce the amount of lumens stated[45-50,000] i would be really keen to know how to get this lamp if it can indeed produce these amounts.. but great results and you have shown the doubters the virtues of using CFL's..well done


Papa Indica 2015-07-02
One thing that may have improved the results would be to eliminate the reflector and just use a hippie hanger. These types of bulbs don't do well with reflectors. The side of the bulb that faces the wing is all virtually wasted light because they don't have the intensity for that reflected light to be of any real use. To be really effective, it would be best to add another bulb, (using hippie hangers), and let the bulbs hang right down between the tops of the plants. That way all of the light from your bulbs is reaching them. Even if I only had one, (actually, especially if I only had one), I'd still do it without the reflector wing. Don't get me wrong, that's a decent looking result but, in the end, these bulbs typically do better without reflectors. (CFL bulbs)

Alchimia Staff

Dani Alchimia 2015-07-03
Hi Papa Indica, Nice point there, it would be interesting using a luxometer to check the distribution of light with and without reflector. Thanks for your contributions Papa Indica! Best vibes!

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