here is info on the light itself. this is copied from the company pdf file.

Technical Features:
• 250 Watts – fifty 5 Watts Philips Luxeon™ LEDs – the highest flux LED available.
• Uses 60% less power than equivalent 600 Watt HPS light.
• Individually adjustable Red and Blue balance knobs allow precise 2-channel spectrum control for your specific plant type.
• Recommended coverage area: 12-16 square feet.
• Runs warm to the touch.
• Our own constant current PowerDrive™ LED controllers efficiently drive the industry’s
most powerful LED.
• Easy On/Off switch, electrical protection, thermal shut-off, fused input voltage,
and detachable power cord.
• Made in California, USA.

Electrical Specifications:
• Operating Voltage 110 US, / 240V European (3A max/1.5A max)
• Operating Frequency 50Hz-60Hz
• Typical Power Consumption Approximately 260 Watts
• Weight 13 lbs
• Dimensions 13”W x 17”L x 7“H
• Operating Temperature –20º C to 60º C (–4º F to140º F)
• Lifespan 50,000 hours+

there are 50w of Blue and 200w of Red.

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i have the light over 6 of my Purple Rain girls(PurplexBigBud). i wont consider this an LED only grow, as the light shares the same room with my 3-1000w HPS and will benefit from the extra spectrums.

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Distance from the canopy is 18" and it covers the 3x4 bin perfectly.

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i contacted LumiGrow for advice on the unit. here is what they said:

At present we do not have a usage guide, but we are happy to offer some tips to help you get started.

1. The suggested distance to plant canopy as primary lighting is 12" to 24". The light spread of the LED's is approximately 120 degrees. This means that if you hang the light off the canopy by 12 inches, you will cover a 3x3 table and at 18 inches, you will cover a 4x4 area.

2. There is no problem letting the plants grow right up to the light. There are no known instances of plant damage as a result of too much heat underneath a LumiGrow light.

3. Depending on your style of watering, you will notice that significantly less water and nutrients will be necessary. For example, in our grow labs, where we use ebb and flow systems with rockwool cubes, we have found that the evaporation rate is half as much as under a 600 watt HPS system.

4. Flowering will last a little longer with the LumiGrow light. In our experiments with chrysanthemums, a short day plant, we have seen that the flowering will start up to a week later, and can last longer. The quality of the blossoms were exceptional.

5.. If you live in a cooler area, but need some heat for your plants, you may find that our light does not produce enough heat to warm the surrounding air temperature by more than a degree or two. You may need to add secondary heating if that is the case. For example, in our tests with bell peppers, we found that the addition of a small heat source was necessary to promote proper growth and fruiting. A 60 watt incandescent was actually perfect for our needs....

5. Based on feedback from other users, we are now conducting trials of a "hybrid system". So far we are about three weeks into the test and we are seeing some exciting results. The test plant is a dwarf variety of tomato known as a "Tiny Tim"

Our hybrid system consists of one LumiGrow , Model 1, 250 watt light and one 125 watt CFL (Compact florescent light ) fixture. This is using a total of 375 watts of power and is thus far is competing favorably with a 1000 watt HPS system. Our light is designed to be on a par with a 600 watt HID, so this is a dramatic savings in power.

Again, it is early days for the experiment and we cannot necessarily recommend you grow your plants using the same method. It does seem though that the addition of the green and yellow components (found in the the CFL )may perhaps provide benefit in the plant's secondary responses while our light really punches in the red and blue part of the plant spectrum for photosynthesis.

i will be feeding the plants with 1/2 strength nutes. I might add some t5 side lighting for added green/yellow spectrums.

I use Cutting Edge Solutions 3 part formula (Micro/Bloom/Grow). at 2 weeks i will add Bushmaster to stop vertical growth. with the Bushmaster i also start using Purple Maxx. at the end of week 4 i will start the Gravity which will harden up the flowers while the Purple Maxx stacks the sites. At this time i mix in some molasses and Sugaree (also by CES). i use the Gravity for 2 straight waterings. then i start to flush. So that is my basic feeding regime. I also use Hygrozyme, Zone (DM), Cal-Mag (Botanicare), and silicon.

nice, very nice!
I wish you well with your hybrid chrysanthemums and will love to see your progress.
go forth and bloom those sweet flowers.
Made in California 'eh!

Don't answer this, but silicon? I gotta look that one up. I've heard of silica (like Foxtail) - sorry to think out loud.

yes silicate, its all the same.