Quote:
Originally posted by barjam
Why was sodium mentioned, they are far, far, far more efficient than any technology commonly available topping out at 200 lumens per watt. Compare that to T5HO at 85.
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You need to be real careful when you make these comparisons. They are simply comparing Lumns and not looking at color temperature, or PAR values that we are concerned about. Sodium Lights produce light in a very narrow frequency range that has in in the yellow part of the spectrum.
Quote:
Originally posted by barjam
MH range from 65-115. T5HO is less efficient than T5 (that is listed) and is in the 85 lumens/watt range..
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Again we look at the MH's that are at 115 Lums per watt and these are usually at very low Color Temps like 2,700K or even 2,400K. When you get up to 10,000K to 20,000K the Lumns poer wat does drop off considerably.
Whare we need to get a good equivelent is someone comparing different bulb types that are at the same color temperature. And even at that you can look an Sanjay's data and see that one manufacturer to another often have more than 50% of a difference.
So what you need is a table showing PAR, LUMs, Color Temp, Manufacturer, and Type of Bulb. And even with that the reflector design will make a big difference. As an example the Lums prodiced by CF bulbs are much higher than what is usable do to the reflector design.
Dennis