Florescent to LED switchover - Quantity?

[duc916]

I have three light fixtures in my garage. Each florescent fixture has 4 bulbs that are 48" long. The 3 car garage is 20' x 36' with a 13' ceiling height, so the three fixtures do not illuminate the space very well. All three fixtures are on a single light switch. I want to switch over to new LED fixtures and add as many lights as I can on the same single switch. How do I calculate how many LED bulbs like these (see below) I can install on that circuit?

LUMEGEN LG-4T8-22WBB-SM50K(5000k)(4000K)(3000K) 48" 22W LED T8
2640 Lumens per bulb, 120° Beam Angle

 

[spudley]

Most lighting circuits are protected by a 15 amp breaker, and in a 120 volt system that gives you 1800 watts available. Normally you'd keep usage below 80% so that'd give you 1440 watts, minus whatever else is feeding off that circuit. If only lights are on the circuit, divide 1440 by 22(watts) per tube.
You're going to be surprised how bright just replacing bulbs in your existing fixtures will be.

 

[JimVonBaden]

I have a 15 amp light circuit, and a total 20 amp garage circuit. I run 6 double LED 4' lights and two florescent (for now) lights. On top of that I can run my 110V compressor, or my 11oV welder without tripping the circuit breaker.

They pull so few amps that you could run 20 LED lamps or more on them. BUT, don't convert your florescent lamps, buy new LEDs. The LED conversion lamps sometimes use the florescent ballast and that is not efficient when converting. Besides, the dedicated LEDs have proper reflectors for LEDs.

 

[duc916]

Thanks for the input. Based on spudley's calculations I can run up to 65 LED tubes, which is more than my budget will allow. Now I can go through Platonic Solid's thread and work on a layout.

 

[theoldwizard1]

Watts is a ******** measurement carried forward from incandescent bulbs. What you really want to look at is lumens and maybe temperature if the color of the light is an issue.

 

[duc916]

theoldwizard1 - can you offer a more in-depth explanation? I am not sure how you calculate acceptable current load on the 15 amp circuit with lumens and light temperature?