For cuttings and germination, we recommend a neon light, or low consumption LED type
Different types of lamps can be used for growth: sodium vapor (HPS), metal halide (HM), ceramic (LEC) and LED.
The HPS (mixed) and HM (growth only) lamps are the ones we have used regularly. Ballasts for HPS and HM lamps.
LED and LEC lamps are a more expensive investment, but consume up to 50% less. LED lamps are longer lasting, and there are no bulbs to change. It always works with the same performance.
For flowering: There is the classic HPS lamp (sodium vapor), which 40 years ago was used for indoor crops and that continues to evolve with more effective bulbs. It is an affordable solution, although it implies a higher energy consumption, and the need to change the bulb from time to time.
We also use LEC (ceramic) lamps that reduce consumption considerably, although with a lower yield than the classic HPS.
The important progress of these last years is the appearance of really effective LED bulbs for flowering, and at the same time obtain significant energy savings. It is a higher investment, but it is easily amortized over time, and allows crops to be grown in summer due to its low heat production.