my hps is 2100k. i heard for flowering it should be around 2700. whats up with this?

is that flowering # correct and does my light suck?(its 400w)

I said in that other thread that the numbers might not be exact it is probably 2100. My bad.

2100K is fine. I have a 2300K HPS bulb and it's worked fine for me over the years.

I think somebody is mismatching watts and lumens on this one. A 400 watt HPS should cover 5 square feet surace area with enough lumens (measurement of light) to do a decent grow..or at least that what the man who sold it to me said. It has worked just fine so far. Assuming you have a normal heighth ceiling etc. If you have a ceiliing 3 foot tall you will burn it up. Course I told him I was raising Habaneros..sure he believed that one Wink wink.

bigwheel said:

I think somebody is mismatching watts and lumens on this one. A 400 watt HPS should cover 5 square feet surace area with enough lumens (measurement of light) to do a decent grow..or at least that what the man who sold it to me said. It has worked just fine so far. Assuming you have a normal heighth ceiling etc. If you have a ceiliing 3 foot tall you will burn it up. Course I told him I was raising Habaneros..sure he believed that one Wink wink.

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I think he is mixing up kelvin (K) and hps (a type of light)

Kelvin is the color band.

2,700k is supposed to be ideal for flowering, 6000+k is supposed to be great for vegging. As I understand it though a High Pressure Sodium light (hps) is great for all phases of a plant's life. I would not worry about a gazillion and four people here do all hps grows.

Us cfl growers are far more anal on our kelvin readings as we switch out cfls. (a set of them for veg, a different set of them with a different kelvin rating for flower)