You already have available at your trustable online store the dual spectra low consumption lamp Pure Light Dual, by its characteristics you will be able to use it along the whole crop cycle without having to replace the growth spectra bulb by the flowering spectra bulb. This is thanks to its dual light spectra that includes blue and red wavelenghts.
The fluorescent light bulbs of low consumption do not give off hardly any heat and have a great durability, all these features together with its energy saving are a very interesting choice. Ideal for those marijuana growers who want to make clones, keep mother plants or increase flowering power your previosly installed sodium lamps to get premium results.
In addition they have a reactance built-in so that you only concentrate on screw them and ... the lamp begins to run. They have a durability of 9000 hours and a power of 70 lumen / watt are you going to run out of them?