Are these led lights dimmable?

The cords have an on/off rocker switch built in. Generally this style of LED is not dimmable. Each is individually not that powerful. I am adjusting the intensity by adding and subtracting tubes and adjusting the height over the plants. It is working out fairly well. For an 18" x 48" shelf I am using 3 tubes. I just used these this season for seed starting and those plants were just put in the garden. They worked well.

How many lights and what distance for sowing seeds for 48"x24" flats?

We do not use them for seed flats at this time but will likely do so next spring, These are very bright, powerful lights. I would use no more than two 48 inch per flat. Not knowing your location or setup I do not think that these bulbs will generate enough heat without other supplemental heat.

How far apart in parallel should the lights be placed for growing seedlings?

The height would also need to be considered as for spacing in parallel. 12 to18 inch for approx 12 in height

I bought a six pack of 2' lights. the shelf is 16" x 36". How many 2 foot lights per shelf?

I turned my walk in closet into a nursery. I have 3 long shelves around 4’ in length and 2.5’ in depth. I use 2 lights per shelve. That’s been working for me.

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Barrina 4FT T8 Grow Light, 42W Full Spectrum Grow Light, 6 Pack

Product ID: 765241731

Details

Brand
Barrina
Colour
Pinkish White
Indoor/Outdoor Usage
Indoor
Light fixture form
Pendant
Material
Aluminum
Power Source
AC

🌈Full spectrum sunlight replacement

💡42W power-efficient brilliance

🔗Link up to 6 lights seamlessly

¥102992

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Illuminate your indoor jungle with power, precision, and style!

SPECTRUM OF SUCCESS - Full spectrum light tailored to plant absorption maximizes photosynthesis and boosts indoor garden yields.
COOL DURABLE DESIGN - 100% aluminum shell ensures superior heat dissipation for longer LED lifespan and consistent performance.
POWER MEETS PRECISION - 42W LED grow light replaces bulky 1400W traditional lights, saving energy without sacrificing growth power.
PLUG PLAY PERFECTION - Effortless installation with included clips, tapes, and connectors—set up your grow light system in minutes.
GROW TOGETHER SHINE TOGETHER - Link up to 6 units with new-gen connectors for scalable indoor gardens that keep your green thumb ahead of the curve.

The Barrina 4FT T8 Grow Light 6-pack delivers a 42W full spectrum LED solution designed for indoor plant growth. Featuring 1152 LEDs and a high PPFD output, it replaces traditional 1400W grow lights while consuming significantly less energy. Its aluminum housing ensures efficient heat dissipation, extending LED lifespan. Easy to install with included accessories and linkable up to 6 units, it’s perfect for hydroponics, greenhouses, and grow tents. The light’s pinkish-white output protects eyes while optimizing plant photosynthesis, making it a top choice for millennial plant enthusiasts seeking efficient, scalable indoor gardening.

Specifications

ASIN	B082ZKJZP1
Best Sellers Rank	#380,903 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #125 in Growing Light Fixtures
Brand	Barrina
Bulb Base	G23
Colour	Pinkish White
Connectivity Protocol	Corded
Control Method	Push Button
Controller Type	Push Button
Country of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (2,160)
Efficiency	Higher than HPS/MH lights
Enclosure Material	Aluminum Polycarbonate
Finish Types	Powder Coated
Fixture Type	Non Removable
Included Components	Power cords with ON/OFF switch, connecting cords, small connectors, installation clips, tapes, cable ties
Indoor Outdoor Usage	Indoor
Installation Type	Flush Mount
Is Assembly Required?	Yes
Item Dimensions L x W x H	119.6L x 3.3W x 3.5H Centimeters
Item Weight	7 Pounds
Light Color	Pinkish White
Light Fixture Form	Pendant
Light Output Maximum	3100 Lumens
Light Source	LED
Lighting Method	LED
Lumens	3100 Lumen
Manufacturer	Bailina Lighting Electric Appliance Co.,Ltd
Manufacturer Part Number	QL42
Model Name	Barrina LED Grow Light
Model number	QL42
Mounting Type	Ceiling Mount
Number of Items	6
Number of Lights	6
Other Special Features of the Product	Easy Installation, Full Spectrum, High PPFD, Linkable
Power Source	AC
Recommended Uses For Product	for indoor using
Room Type	Indoor
Set Name	Barrina 4FT T8 Grow Light 6 Pack
Shade Color	White
Shade Material	Aluminium
Shape	T8
Size	4FT
Specific Uses For Product	Indoor use only
Style	Pack of 6
Switch Type	Push Button
Theme	Indoor Use, Plant Growing
Unit Count	6 Count
Voltage	270 Volts
Water Resistance Level	Not Water Resistant
Wattage	42 Watts

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