Well I went and looked it up, here is what I found:

The lux (symbol: lx) is the SI unit of illuminance and luminous emittance. It is used in photometry as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual (but not circadian) brightness perception. In English, "lux" is used in both singular and plural.[1]

Explanation:

Lux is a derived unit based on lumen, and lumen is a derived unit based on candela.

One lux is equal to one lumen per square metre, where 4π lumens is the total luminous flux of a light source of one candela of luminous intensity:

1 lx = 1 lm·m-2 = 1 cd·sr·mâ??2.
As with other SI units, SI prefixes can be used, for example a kilolux (klx) is 1,000 lux.

Illuminance Example
10−5 lux Light from Sirius, the brightest star in the night sky[2]
10−4 lux Total starlight, overcast sky[2]
0.002 lux Moonless clear night sky with airglow[2]
0.01 lux Quarter moon
0.27 lux Full moon on a clear night[2][3]
1 lux Full moon overhead at tropical latitudes[4]
3.4 lux Dark limit of civil twilight under a clear sky[5]
50 lux Family living room[6]
80 lux Hallway/toilet[7]
100 lux Very dark overcast day[2]
320â??500 lux Office lighting[8][9][10]
400 lux Sunrise or sunset on a clear day.
1,000 lux Overcast day[2]; typical TV studio lighting
10,000â??25,000 lux Full daylight (not direct sun)[2]
32,000â??130,000 lux Direct sunlight

Basically what this says is Luxx is Lumens over a specified area of 1 sq meter. And that Luxx is a measurment of Lumens not PAR.

Unfortunately I will need to see how effective these are in either a PAR measurement or in a fully grown (from clone to crop). To decide if these are in my future.

Just because I think(and know) it's bright. I DON'T know it's right.

I have no reason to believe these CAN'T work! As was said early on, these are just a tiny HID. Thus the tech exists, question is are the bulbs that are available now capable of the intensity in those frequencies we so desire?

Maybe some of us should email EYE and get them to make Hortilux versions of these.
Vancefish Reviewed by Vancefish on . automotive HID lights vs. cfl's Hi, I'm starting this thread to compare a variety of lights for small closet grows. First i'm posting only light outputs of 250 watt 6400K vs. 250 watt 25000K vs. automotive HID lamps. I built three indenticle boxes 24' X 22" x 36". I'm measuring output at the bottom of the box. in the first photo the box on the bottom left is the 6400K 250 watt cfl, bottom right is the car HID and the top is the 250 watt 25000K. Average light output are as follows. 250/6400K 5000lux peak was 5410 lux, Rating: 5