The 14.5 watt T91 is rated at a fairly low 750 lumens, but will need dimming in many situations. Dimmed to 10%, drawing 1.5 watts, it is a beautiful night light. Somehow, lumens ratings here are not to be trusted. A 23 watt CFL rated 1600 lumens and equal to 100 watt incandescent, gives less light than the full-on T91. Please tell me whether you agree. At December, 2012, amend this post, noting photo demonstration of the equivalence of plate LEDs to light bulbs. A plate, beaming all light from a flat plane, gives twice as much illumination as a bulb. The T91 is found to be equal to a 150 watt incandescent bulb. With this recognized doubling of efficiency, why will anyone still want to use bulbs?
Here is Insulation Math, for involved energy costs, where such lights have been baffled, to surround them with insulation:
With math for my home, the uninsulated area at each can light loses $2.4*0.8/3 = $0.64 per year. Bulb local heat is all lost in winter. Countable pennies are lost in heat-driven excess of house fresh air exchange through any can gaps
Please read more, in a Picasa Web Albums Slideshow:
The preferred installation has replacement of a can, with a 4" junction box.
With Blogger Labels feature, find all of my discussion of these wonderful LED plate lights: http://energyconservationhowto.blogspot.com/search/label/LED%20Plate%20Lights
The discussion will include all LED plate lights made by Lighting Sciences Group Company, LSGC, the 6" light sold as T91 at Home Depot, and an even more useful 4" light, not yet available at Home Depot.
At December, 2012, watch a revolution in the offering of plate LED lighting, with new Home Depot products, and hopeful availability of all LSGC plate LEDs at Lowe's stores. In arguments for new marketing measures, I offer an expansion of associated Insulation Math, above. The difficult swap-out of a can light, in the Picasa Web Album was at cost of $60, installed. With marketing efficiency and training, I suggest a $60 installed cost can be profitable to the contractor.
Typical $1 per year heat loss per can, plus excess cost of electricity. For electricity cost assume a maritime climate with $0.15 per KWH electricity cost. Consider a light that is on 4 hr per day, 1460 hr per year, Cost is $14 per year at 65 watts and $3 per year at 14 watts. Each change-out saves about $12 per year per fixture. Simple payback is in five years if total replacement cost is held at $60 per fixture. This is irreversible repair of a heat bleed, far better than putting a 23 watt CFL in the leaky can, $5 per year electricity cost, only $9 per year saving of energy. We are looking for fullest easy, painless energy savings, not fastest payback of any investment.
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