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These dimmable lamp transformers are designed without noticeable hum when used with many high quality dimmers. Because of the toroidal design, these dimmable lamp transformers are more efficient and use less material than conventional transformers. Please contact us and talk to our engineers to ensure our lamp transformers work with your application.

dimmable lamp transformers

  • UL recognized to UL506
  • CUL certified to CSA C22.2 No. 66 standards
  • ROHS compliant. Class B (130ºC) Insulation
  • Low Temperature Rise
  • Excellent Voltage Regulation
  • Low Mechanical Noise
  • Light Weight
  • Low Profile

Dimmable Lamp Transformers


Primary: 117VAC/60Hz
Secondary: 11.8VAC
Part No.
Temp. Rise/
Full Load
PriceU150120W2.4"1.2"0.8 lbs.14.1V38ºC
PriceU150250W3.2"1.3"1.5 lbs.13.4V41ºC
PriceU150375W3.5"1.5"2.1 lbs.12.9V35ºC
PriceU1504100W3.7"1.6"2.5 lbs.12.9V40ºC
PriceU1505125W3.9"1.6"2.8 lbs.12.8V46ºC
PriceU1506150W3.9"1.8"3.3 lbs.12.8V47ºC
PriceU1507300W5.0"2.0"5.5 lbs.12.5V48ºC
PriceU1508500W5.5"2.5"9.1 lbs.12.3V46ºC
 Price U1509750W6.4"2.5"12.6 lbs.12.2V45ºC
Price U15101000W6.4"3.2"16.9 lbs.12.2V 46ºC
The temperature rise of a toroidal power transformer
operating at 50% of full load will be only 25% of the
temperature rise shown above at full load. Recommended by GE for optimum Halogen Lamp Life and Performance
Need custom specifications for your transformer? Click here.

UL and CUL Agency Files
UL and CUL have issued the following reference (file) numbers for our construction approvals received for all our standard designs and over 500 custom designs.


Smaller transformers are supplied with one metal washer and two rubber pads, for power ratings up to 800VA. Larger transformers are typically supplied with an epoxy potted center with a hole for mounting.  Other mounting options are available.
Safety Standard
UL 506 (Non-medical)
CSA C 22.2 No 66
Agency Reference
UL file E-161696
C-UL file E-161696
Detailed datasheets are available for
all listed part numbers.
Caution - If you choose to apply your own mounting solution, remember that it is important that our transformer be mounted in such a way that the mounting screw and the metal chassis will not form a closed loop through the center and thereby create a shorted turn on the transformer.

Terms and Conditions

  • For larger quantity prices, please contact the factory directly.
  • Prices and data subject to change without prior notice
  • Delivery: Small quantities of standards are normally available from stock
  • 30-Day Return Policy of Undamaged Items - 15% Restocking Fee on Standard Transformers
  • 36 Month Product Warranty
  • Terms and Conditions