CFLs and LEDs in particular tend to use ‘equivalent wattage’ ratings. Basically, that means that the wattage advertised is usually not the actual wattage used by the light. Rather, they’re saying that the light is strong as (or equivalent to) a light with the advertised wattage…despite not having that wattage.
Believe it or not, HPS lights still have a lot to offer despite their seemingly old-fashioned technology! In fact, their old-fashioned technology is part of what makes them such great lights! For example, it makes them much more…
High pressure sodium grow lights – frequently referred to as ‘HPS’ grow lights – were invented around 1970 as an alternative to the then-popular low pressure sodium streetlight.
First, they’ve been used for so long that they’re a well documented piece of technology. People have been writing about how to use them for years, and that information hasn’t changed.
Straightforward & Predictable
Straightforward and predictable…kinda sounds the same, doesn’t it? Are there grow lights that are complicated and unpredictable?
This one is a bit tricky. HPS lights have a reputation for generating tons of heat that needs to be dealt with. I agree that this is true; HPS lights do make quite a bit of heat which make an exhaust system necessary for anything over 250w…but it’s not for the reason most people think!
As consumers we’ve all learned that the cheapness of something can sometimes be an indicator of its low quality, but HPS’ are actually cheap for a pretty good reason. HPS lights have been used heavily in the US as streetlights since the 70s, and the technology used in the streetlights is pretty much identical to the technology contained in HPS grow lights.
You might think low pressure and high pressure sodium lamps are very similar, but in fact they have quite some major differences in between them. LPS lamps use a vacuum glass envelope that is coated with a layer of indium tin oxide, a material used to reflect and stop infrared rays. The light is allowed to go through this coated glass, but infrared’s are stopped by the indium, so almost no amount of heat comes from a LPS lamp. The color temperature of the light usually has a white or yellow tinge, which makes them a good choice for plants that need lighting as similar to sunlight as possible.
So you see, they are the best at replicating actual sun light, they give off almost no heat, and are quite efficient, they also last longer at full intensity..
They are slightly less powerful But way more powerful than florescent, But because of almost having no heat, you can put more/bigger lights in an area.