In most cases the resistors, installed in the lighting elements, provided with the light-illuminating diodes, may be substituted. For example, the resistors, installed on such tapes, may be substituted by the nil ones:
These tapes are meant for durable operation at tension of 12 V; however, their illumination will be brighter, if they are fed from the battery, consisting out of three sections of the Li-Po batteries, and resister is the substituted by the nil one. The nil resister may be installed, seeking for the following colors: white, light-blue, blue and green. The elements of the red color burn out quickly without resisters.
Generally speaking, the price of the diodes in a similar assemblage is not high; the tape with 30 light-illuminating diodes costs approximately 10 EUR. 100 such light-illuminating diodes are necessary for sufficiently good lighting of the helicopter. But the el. current, supplied to the diodes, should be increased. Most probably, the light-illuminating diodes of the series EL67-21*** are installed in these tapes. I use feeding from two sections of the Li-Po battery and I connect such diodes of the white, blue or green color in couples – consecutively and each 25 couples – in parallels from each side, without extra resister. I connect the same assemblage of the light-illuminating diodes of the red color consecutively via the diode 1N5400. The diode reduces tension, supplied to the light-illumination diodes, for 0,8 V.
The impulse el. current, meant for each separate light-illuminating diode makes approximately 50 mA per each one. I use the wires with the total area of cross-section of the threads, amounting to 0,25 mm², for connection of the light-illuminating diodes. Such wires are able to endure the supplied el. current and substitute resisters to a certain extent (In my opinion, use of thick wires is inexpedient). If the battery is fully charged, the el. Current, which passes via separate diodes, may reach 100 mA. As regards myself, one diode out of one hundred diodes used to burn out after ten flights in average through the high-voltage el. current. According to me, it is acceptable. After burning out and substitution of approximately ten weakest diodes in the assemblage, the diodes ceased to burn out. This is the view of the assemblage, consisting out of 50 light-illuminating diodes, which is fixed on the landing gear:
