What is the Kelvin number? I need grow lights that are good for microgreens.

Short answer: These lights will work well for your microgreens. For microgreens and most plants, the Kelvin number is less important than the PAR output. (PAR = Photosynthectically Active Radiation) I bought some of these lights to test them and I have tested the entire Barrina line of LED lights for PAR output including the shop lights. All them will work for you. I did not test for Kelvin output. The specific frequency output on which the Kelvin rating is based, is provided as a graph by the manufacturer on the product page. But if I had to guess I'd say the output was 5,000 Kelvin or lower; so it's a relatively warm colored light which might be good for your purposes. Some researchers have gotten very high microgreen yields using lights with a higher red to blue ratio. My family grows microgreens and other crops commercially and we use Barrina LED lights almost exclusively. These lights will work well for greening your microgreens, but we actually don't even bother with lights specifically marketed as grow lights for our microgreens because we found that nearly any lights are adequate for that purpose and others are less expensive. We use the cheapest Barrina general utility strip lights and they work great. The specific lights we are presently using for our microgreens is the following light which has a kelvin rating of 6,500 which is a bright, cool white that is higher in the blue range: https://amzn.to/2QDJ2HW We use 4 or 6 of these about 10" above four 10x20 flats of microgreens on 48"x18" wire shelves. I recently began removing the diffusers from these lights because doing so more than doubles the PAR output making them more useful for our vegetable and flower seedling starts, but be advised that doing so absolutely voids the warranty. I don't care about the warranty. I've been using these lights for more than a year with no problems whatsoever and they are cheaper than dirt to replace in any case. If you remove the diffusers, just don't get any water or dirt on the LEDs.

If you look at the last image it has a chart showing the umol at different heights. But I would be careful place them to close in a real world situation depending on the growth stage of that plant you could cause some leaf burn. These are very powerful lights in small foot print. From my experience with these lights I went down 10" . I've tried it to get to around 150 umol/m2/s aka the sweet spot, but I noticed right away by examining the leaves under a loop I had an issue. I hope this has helped. So I just stick with 12" just to be safe.

For starting seedlings, is one strip enough to light a 4' x 2' area or should I use 2?

I have them, and I would use 2 to keep the plants from "leaning".

Is this really full spectrum or just 6500K

Dear customer, These lights are not 6500k. They are full spectrum.The spectrum is different from shop light. Our listing shows the spectrum graph. Please check. Thank you so much.

Brand	Barrina
Color	Pinkish White
Material	Aluminum, Polycarbonate
Style	Modern
Light fixture form	Ceiling
Room Type	Indoor
Product Dimensions	47.1"L x 1.3"W x 1.38"H
Specific Uses For Product	Indoor use only
Indoor/Outdoor Usage	Indoor
Power Source	AC
Installation Type	Linkable Ceiling Mount
Special Feature	Energy Efficient, Full Spectrum
Number of Light Sources	4
Voltage	120 Volts
Light Color	Pinkish White
Shape	T8
Included Components	Light kit inlcuded
Warranty Type	Extended or Limited
Lighting Method	LED
Item Weight	2 Pounds
Number of Items	4
Wattage	42 watts
Controller Type	Push Button
Switch Type	Push Button
Unit Count	4 Count
Brightness	2900 Lumen
Efficiency	High Efficiency
Mounting Type	Ceiling Mount
Shade Color	white
Fixture Type	Removable
Assembly Required	No
Manufacturer	Bailina Lighting Electric Appliance Co.,Ltd
Part Number	INWT80421265Ec
Item Weight	2 pounds
Country of Origin	China
Item model number	INWT80421265Ec
Collection	led grow light
Special Features	Energy Efficient, Full Spectrum
Plug Format	plug in
Batteries Included?	No
Batteries Required?	No
Beam angle	270 Degrees

Barrina T8 LED Grow Light 4FT,168W(4 x 42W), 1000W Equivalent, Full Spectrum, V-Shape with Reflector Combo, Grow Lights for Indoor Plants, Greenhouse, 4-Pack

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