A blanket statement like that does not stand up to scrutiny. In general HPS street lights are more efficient than CFL street lights... but we are not talking about street lights. Targeted spectrum CFLs produce much more plant usable light per watt than HPS.
Think about it.... this is the reason I can offer the money back guarantee... targeted spectrum CFL is simply more efficient than HPS.
Are you going to put your money where your mouth is?
You keep trying to mix apples and oranges. You keep talking about light, but when you are growing plants... plants only care about plant usable light. Does not matter how much light (and heat) an HPS lamp produces if the plants are going to ignore most of it.
Think about it.... this is the reason I can offer the money back guarantee... targeted spectrum CFL is simply more efficient than HPS.
Are you going to put your money where your mouth is?
Ok, let's compare cost for a 150 watt lighting solution. Basically, we are talking about enough light for a 2 ft. x 2 ft grow tent.
HPS 165
The base cost of a 150w HPS is $67. (
http://www.amazon.com/Sun-System-900490-Light-Fixture/dp/B00KM1EXXW)
A 150 watt HPS uses about 165 watts when paired with a required ballast. Electric bill will be more.
You will also need to buy a much taller grow tent because HPS needs to be 30 inches above the plants... more money
You also have to deal with the heat from the HPS... this is extra money. If you have a closet grow in an air conditioned home... this will jack up your electric bill.
WEEDBULBS 144
The base cost of two of the 4 packs is ~$60. But you only will use 6 of the bulbs, so cost is ~$45.
6 of the lamps is 144 watts including ballast. Electric bill will be less.
A shorter grow tent can be used since the lamps can be placed about 9 inches above the plants... less money.
Also, less heat to deal with means lower electric bill.
And the bottom line here is that I will guaranteed the above WeedBulb system will produce more weed per watt than the HPS system.
It is easy to use the word "inefficient" when you don't know jack. Are you willing to put your money where your mouth is?
You are obviously not a lighting expert. None of our bulbs have tint on them... tints block/filter light. WeedBulbs simply use highly efficient targeted spectrum phosphors.
I am a lighting specialist and also have a degree in horticulture. So you can all the lighting specialists you know... but there is no magic that they can do to make the above described HPS lighting system grow more weed per watt than the above described WeedBulbs system.
The bottom line is that WeedBulbs are better in terms of weed per watt for a stealth closet grow than HPS... and I am willing to guarantee it.