Comparing Line Voltage and Low Voltage
This month, Randall tackles a cost/efficiency comparison between line voltage and low voltage light sources.
Low voltage recessed adjustable fixtures, using 12V halogen lamps, provide 100W of dazzle for 50W worth of power.
Randall, in the middle of a family room remodel, my customer’s architect recommended low voltage recessed lights (MR16). But the less expensive alternative is line voltage 4-inch recessed lights. Can you provide a cost/energy-efficiency comparison between low voltage and line voltage?
I often hear people saying that an MR16 bulb uses less electricity than a 120V reflector bulb. In truth, a 50W MR16 bulb uses as much power as a standard 50W reflector bulb. The difference is that it gives you close to 100W worth of illumination for 50W worth of power consumption. But there is also the issue of lamp life: low voltage bulbs compared to line voltage bulbs. A standard household bulb lasts 750 hours, while a standard reflector bulb lasts 2,000 hours, and a standard MR16 lasts 6,000 hours. Note that this is what is called average rated lamp life, which essentially means that at the rated life, such as 750 hours for a household bulb, half of the lamps would be burned out at the 750-hour mark and half would last longer than 750 hours.
Randall Whitehead, IALD
Lastest from ask randall
Is Christmassy really a word? I agree with you, though. While I am seeing an increased use of lasers for tree lighting, the colors available are... read full story
Hoarding is such a harsh term. I prefer squirreling away. Fear not. I don't think that the low wattage versions of these lamps will be taken off the... read full story
You are right. That lovely chandelier of yours burns up to 800W worth of power every time you turn it on. Luckily, there are LED options out there.... read full story
Live CEU Webinar: LED Lighting 204 - LED and Solid-State Lighting Opportunities for Aging Eyes, Health and Behavior
Wednesday, Aug. 26, 2-3 p.m. EDT Register for this free CEU webinar by clicking here. Webinar Overview:Learning units:AIA/CES LU (HSW) 1.0 Learning UnitIDCEC (IIDA/ASID/IDC/... read full story
Sponsored by Bock Lighting, CSL, Fanimation, Pure Lighting/Edge Lighting and USA LED Lighting Solutions. Wednesday, June 10, 2-3 p.m. EDT This free CEU webinar has... read full story
Archived CEU Webinar: LED Lighting 202 - LED and Solid-State Lighting Design Update for Residential Applications
Sponsored by Emerson, Ferguson and Pure Lighting/Edge Lighting. This free CEU webinar has already taken place, but you can watch the archived presentation on-demand by... read full story