[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [APD] HPS, Lumens, and PAR

Daniel Larsson wrote:
> The thing is  HPS:es usually have only a big ugly spike in the
> yellow-green part of the spectrum that plants reflect or have
> to use accessory pigments to use (inefficient). So lumens
> per watt is only a measure of how efficient the bulb is in
> making human visible light, and we are very sensitive
> to yellow-green, which plants reflect.

Right, but with most bulbs that's all we get. So it's better than 
guessing. It does correlate with PAR better than wattage alone does.

Jerry Baker
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com