Lighting your cannabis plants is one of the most crucial aspects of growing cannabis.
White light promotes healthy growth, yellow light is important for the bloom phase. Fluorescent lights can be used as a source of white light, while for yellow light there are the High Pressure Sodium (HPS) lamps. Using Fluorescents during bloom though is not recommended; it works (with the right colour code) but the yields are lower. So for growth: sodium or fluorescent, and for bloom: sodium.
NB!: these periods must be consecutive!
The most usual is 1 week on 18 hours of light, this can be shorter if you want your plants to be smaller, but a minimum of 3 days (the plant needs to ‘settle’). Longer can also be fine, then the plant will be bigger and fuller, but you do need to have the space for them (example is a mother plant, which stays under 18 hour light).
If you use extra cooling (air cooled hoods, water cooled lamps, extra pc-fans under your bulb) then you can hang them lower.
Yes you can, but best only in the growth, not bloom period. Light colours 11 (daylight), 21 (cool white), 31, 33 (cool white), 82 (warm white, bloom) are the most used.
33 Neutral Fair
82(7) Extra warm white Good
83(0) Warm wit Good
84(0) Cool white Good
865 Daylight Very Good
93(0) Warm white Very Good
94(0) Cool white Very Good
95(0) Daylight Very Good
96(5) Daylight Very Good
(combinations 1:2 warm / cool white seems to work better) With fluorescents advised distance from plant 5, max 10 cm. In other words, as close as possible, it can even not do any harm if the leaf tips touch the bulb, since it is not hot enough to burn them.
Using a lamp is on 18 hours per day, for 31 days.
You will pay € 66.96 per month. Your lamp is on during the day for 18 hours and the cost price is 0.20 € per kWh. This is just an example, the price per kWh varies (and at night you pay a lot less).
If you are considering starting up, I suggest you also think about investing in simple two auto 20 A fuses and laying a direct cable between the counter and the grower’s corner.
Then take a type XVB 5G2, 5mm² cable and use blue and brown for one group of plus sockets and grey and black for supplying another group. No risk of socket mistakes and over-heating of old, , worn out or heavily overloaded wires. No worry about unexpected tripping of the contacts and putting your cycle under stress. No hassle with extension leads and domino effects.
Buy two double building boxes from your local hardware store (Niko Hydro 55) and four plug sockets, for a lover and enjoyer certainly enough to supply your “tanner” and ventilator through a single 400 with enough juice.
There is often voltage loss due to poor insulation resulting in lower final voltage in existing old plug sockets, warming of the mains itself, and rapid wear at the end appliance can also be connected.
For techies and detail freaks who increase the resistance of the conduit, stray currents moving through insulation to wet places can soon lead to nominal voltage losses of 10 to 15 Volts, which in terms of percentage is not so serious, but if we then apply the laws of electricity, since voltage and current are inversely proportional to each other via resistance. In normal language, with the same load (resistance), the decrease of the voltage leads to an increase in the current, and that’s not good...