Oscillator Powering 6 Modified Led bulbs

[casiano]

Hi Skywatcher.thanks for your words.
Yes,i use a choke coil,the bigger the better it seems.Im planning to get a bigger one.
For now i have only 5 led bulbs rated at 36v ,the other ones are different voltage,so i cannot use them.

[casiano]

The next step is to put 20 or 30 led bulbs to this circuit.
My nearby electronic store has this led bulb at 1.69 euro.

[SkyWatcher123]

Hi casiano, thanks for sharing the information.
Keep in mind, those 12 watt led bulbs will require more input power to get them to high intensity levels, especially if they are all modified and placed in parallel.
That is one of the reasons i chose the 5.5 watt versions or 40 watt incandescent equivalent, so i could get them to a good intensity for lower input.
I installed the other 2 bulbs, now have a total of 12 modified led bulbs in parallel.
The practical illumination is even better and the more efficient boost converter also helps.
Next step, get 4 more led bulbs to modify and add to the parallel string.
peace love light
Here is pic of 12 bulbs, using 7.8 watts.

[casiano]

Yes you are right Skywatcher,the modified 12w led bulb needs 65v to light,instead the 7w bulb needs only 36v.So, the lower the better.I will try the 3w bulb to see what happens.

[magnetman12003]

Can someone tell me how to determine F stop values using a candle power meter?  I have a lux/candle power meter and there must be a way to determine F stops using some sort of equation or equations.  Say I measured  100 candlepower and my next reading was 500 candle power. What f stop value can be found between readings?? 1/3 ?? 1/2??  3/4??  1??  F stop