Electric Heater using Light Bulbs as Heat Source-French Patent

[SkyWatcher123]

Hi all, I made some experiments to determine the best course of action.
So decided to test a 25 count, C9 string of incandescent christmas lights.
I cut the parallel string in half, using 12 bulbs per half and placed each parallel half in series.
So 12 parallel - 7 watt bulbs see 55 volts and the other half see 55 volts also.
Total power input, shown on killwatt meter, is 56 watts or 2.33 watts per bulb.
A sinlge bulb wrapped in aluminum foil, when powered at 7 watts per bulb, starts to smoke, so that obviously will not work, which is why the patent suggests under driving the bulbs.
So at the lower wattage input, I wrapped a single bulb with aluminum foil, then using a thermometer, placed the thermometer in same position at external surface for foil wrapped and non foil wrapped.
The non foil wrapped measured 100 degrees F.
The foil wrapped measured 130-135 degrees F. varying by the position of bulb, horizontal or vertical.
This experiment seems to confirm some of the patent claims and the added surface area of the bulbs, probably enhance thermal transfer to air, as antijon mentioned.
So the plan is, to use the C9 christmas string bulbs as a true test replication device and it is the cheapest way I can think of as well.

I will probably use 6 strings for the test device or 144 bulbs, which would be 336 watts total.
I will have to design a new container to hold the bulbs, though it will probably use convection also.
Your thoughts or questions are welcome.
peace love light

Edit: Just made a test with 4 - 100 watt incandescent bulbs in series, each bulb uses 11.25 watts.
I tested with the thermometer a single bulb in the series string.
Without aluminum foil = 135 F. surface temperature
With kitchen aluminum foil wrapped bulb = 160 F. surface temp.
With slightly thicker aluminum tape = 195 F. surface temp.

[SkyWatcher123]

Hi all, i decided to use regular edison type 100 watt bulbs instead, 30 of them.
After seeing the surfarce temp. of one of them with the foil tape and the increased surface area of the larger, should perform better.
peace love light

[forest]

I solved it many years ago - what is missing is the resonant circuit and electronic circuit to keep filament at exactly the same temperature (using coolers and so on). I believe the limit would be COP=10.

[AlienGrey]

Hi all, I had built a heater previously and then stumbled onto this patent.
https://patents.google.com/patent/FR2504768A2/en?oq=FR2504768A2
My previous heater was using forced air from the bottom and then had plates inside to snake the air flow path around the bulbs.
It is now modified as a convection heater, with a bottom port and a large opening at the top, using 4 - 100 watt incandescent bulbs from the dollar tree.2 sets in series and then placed in parallel, to achieve the half voltage, under driven as shown in patent.
Also, the bulbs are wrapped in aluminum foil.The patent claims the heater is able to use 4 times less power for the same result as a typical space heater.
So far, the bulbs seem to be holding up fine, as long as enough convective air flow is allowed for, since I'm not using fans in my design.
Each 100 watt bulb in each series pair is using around 31 watts, though the patent suggests using a much larger number of lower wattage bulbs, probably for longevity or their is an added efficiency benefit also.
So at the moment, the heater is using around 125 watts input and the temperature at the top opening is 105 degrees F.
It is raising the temperature in this 250 sq,ft. room by 2 degrees F., (with outiside temp of 35 F.), which has much loss, 3 skylights, 1 door with large window and 2 windows.
Seems like the claims may be close to the truth.
I plan to expand the heater to at least 375 watts, using 3 separated compartments.
Your thoughts and comments are appreciated.
peace love light
(https://i.postimg.cc/c69CT471/french-heater-patent-a.jpg)
(https://i.postimg.cc/FYcK9yM1/french-heater-patent-b.jpg)

Nice set of adverts for big boobs and hair restorer FAKE PS i wonder if you mixed them up 
Both pointers take me here Russian women adds  https://postimg.cc/FYcK9yM1

[SkyWatcher123]

Hi all, hi forest, thanks for the reply, would you like to share any information on that.
Hi aliengrey, not sure what you are seeing and where, as I do not see any of that.
Here is one of the bulbs with the tight wrapped aluminum tape.
peace love light