my shop is 10 ft tall 30x40 how many lights would i need and would these barrina lights be bright enough?

A typical woodworking shop at 20 x 24 is 480 square feet. A typical woodworking shop needs an average of 80 lumens per square foot so 480 x 80 =38,000 lumens so 38,400 divided by 5,000 per fixture is 7.68 so 8 fixtures would be good average shop light. High precision joinery and machine shop lighting is usually at 100 lumens per square foot which would put you at 9.6 lights so a 10 pack would give excellent lighting through the whole shop.

can I hardwire 2 series with 5 fixtures in each series to a single switch? I need 10 fixtures in my garage.

I have used the butt connectors to daisy chain three in a row, though the heat cycling in my unheated Indiana garage will disconnect the units. Because of the heat cycle issues, I suggest tying pairs of those stubby pigtails together, and using those instead of those butt connectors. As others have suggested, Gardner Bender GCC-310 Two Hole Plastic Straps, 1-Inch, 3 Pack, are more reliable than those flimsy stainless steel clips.

What is the cri (color rendering index) of this item? thank you.

The CRI is a measure of light compared to the sun. The sun is 1 or 100% everything else is less. In this case the CRI is rated at 85 or more correctly 85% of the sun. To give you a comparison the old parking lot lights that looked yellow and made you and all the cars look yellow had a CRI of around 40%.

Brand	Barrina
Color	5000K
Material	‎Polycarbonate (PC)
Style	Modern
Light fixture form	Close to Ceiling
Room Type	Garage, Indoor, Warehouse, Workbench, Workshop
Product Dimensions	94"L x 7.5"W x 7.5"H
Specific Uses For Product	Garage, Basement, Work Area, Storage Area, Home, Barn, Office, Attic, Workshop
Indoor/Outdoor Usage	Indoor
Power Source	AC
Installation Type	Ceiling Mount
Special Feature	Corded
Control Method	Touch
Light Source Type	LED
Shade Material	Aluminum+PC
Number of Light Sources	10
Voltage	120 Volts (AC)
Theme	Space
Light Color	Daylight White
Shape	t8
Included Components	Accessories Package, Connecting Cable, Hard Wiring, Instruction Manual, Power Cord
Embellishment	Crystal
Lighting Method	Downlight
Item Weight	1.8 Pounds
Number of Items	10
Wattage	72 watts
Bulb Base	GU5.3
Controller Type	Push Button
Switch Type	Toggle
Unit Count	10.0 Count
Water Resistance Level	Not Water Resistant
Brightness	10000 Lumen
Efficiency	High
Mounting Type	Ceiling Mount
Shade Color	Clear, White
Fixture Type	Non Removable
Assembly Required	Yes
Manufacturer	Bailina Lighting Electric Appliance Co.,Ltd
Color Temperature	5000 Kelvin
Size	8FT-10 Packs
Light Output Maximum	10000 Lumens
Recommended Uses For Product	Indoor use only
Model Name	BAX72
Set Name	10 Packs
Part Number	BAX72
Item Weight	1.8 pounds
Item model number	BAX72
Special Features	Corded
Plug Format	A- US style
Batteries Included?	No
Batteries Required?	No
Wattage	72 Watts
Color Rendering Index (CRI)	85.0

Barrina LED Shop Lights, 8FT 72W 10000LM 5000K, Daylight White, V Shape, Clear Cover, High Output, Linkable, T8 LED Tube Light, for Garage 8 Foot with Plug (Pack of 10)

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