Question 1

will it work for 2 40 watts t12?

Accepted Answer

Yes, this ballast should work for either 34 watt or 40 watt. Hope this helps.

Question 2

Will this ballast replace a magnatek 438-l-tc-p that runs 2 t40 48" bulbs

Accepted Answer

This what you asked about: Magnatek 438-l-tc-p ballast that runs 2 t40 48" bulbs. What you must have meant was 2 T12 48" 40 watt bulbs. And the answer is "YES"... this ballast will run two T12 48" 40 watt bulbs. (T12 bulbs are standard 1 1/2" diameter bulbs. T8 bulbs are 1" diameter bulbs).

Question 3

Does this ballast have nine wires?

Accepted Answer

When counting ballast wires you don't add in the power wires. Because one ballast may have black white and green for ground. And a different may only have black and white because the ground is internal. This ballast has a total of 8 wires, but again don't add the power wires and it has 6 to the lamps. 2 blue, 2 red and 2  yellow. This is standard Rapid Start Wiring which is most common wiring in fluorescent lighting. So if you have a different brand, don't count the power wires and if you have 6, 2-red, 2-blue and 2-yellow this would wire exactly same.

Also another word of advice, don't try to count wires to see if its the same. There are plently of ballasts that are rare that may also have 6 wires to the lamps, but wire completely different with 3 yellow, 2 red, 1 blue and be for 3-4 light bulbs. If you ever need help crossing a ballast from one you cannot find PLEASE contact SEMPERLITE. We would love to help you even if you do not buy from us, or buy our items on amazon, we like to help make sure you get the correct item the first time, as too many sellers give false or invalid information and then don't take owenership when they make their errors. Again please contact SEMPERLITE if you ever need any help.

Question 4

will this ballast replace ADVANCE model RL-134-TP?

Accepted Answer

I can't speak for the particular ballast you mentioned.  I bought the one I got based solely on the number and types of lamps it was said to work with (in this case two 40 watt 4 foot long tubes).  I do recall the wiring diagram that came with it wasn't exactly like what was already in the fixture, but I did follow it.  Also, it was a somewhat different physical size than that being replaced and it was necessary to drill at least one new hole in the fixture so that, with one of the existing holes for the old ballast, the new ballast was held in place with two screws.

ASIN	B002B7SAEI
Additional Features	Energy Efficient
Brand Name	Universal
Bulb Base	BA15S
Color Rendering Index	80
Color Temperature	6500 Kelvin
Control Method	App
Controller Type	Push Button
Customer Reviews	4.5 4.5 out of 5 stars (1,212)
Frequency	60 Hz
Global Trade Identification Number	00768386242147
Incandescent Equivalent Wattage	40 Watts
Indoor Outdoor Usage	Indoor
Item Weight	0.16 Pounds
Light Color	White
Light Source Type	Fluorescent
Light Source Wattage	71 Watts
Light Type	Fluorescent
Manufacturer Part Number	B234SR120M-A000I
Model Number	B234SR120M-A000I
Number of Items	1
Package Quantity	1
Power Source	Corded Electric
Shape	Tubular(T)
UPC	768386242147 768386242123 768386240761
Unit Count	1.0 Count
Voltage	120.00
Wattage	40 watts
White Brightness	1200 Lumens

Universal 24214 - B234SR120M-A000I T12 Fluorescent Ballast

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