Project Files of Filament Bulb Library for Proteus: W5W, P21W and #47

FILAMENT BULB LIBRARY FOR PROTEUS - V1.0 (W5W, P21W and #47 incandescent bulbs with a pop-up)
Designed by The Engineering Projects
www.TheEngineeringProjects.com

IMPORTANT LINKS
Article (read it first - pictures, step by step, every feature explained):
  https://www.theengineeringprojects.com/2026/11/filament-bulb-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/filament-bulb-proteus-library
The demo runs on our Arduino UNO V4.0 (included) - working LEDs, RESET and a
built-in serial monitor, no Virtual Terminal to wire - its own article:
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
The switches are our own IRLZ44N MOSFETs (included):
  https://www.theengineeringprojects.com/2026/11/n-mosfet-library-for-proteus.html
and our own 2N2222A transistor (included):
  https://www.theengineeringprojects.com/2026/11/small-transistors-library-for-proteus.html
Support us (the libraries are free):
  https://www.theengineeringprojects.com/donate

FILE STRUCTURE
Filament-Bulb-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPBJT.LIB                                     18.6 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPBULB.LIB                                    17.7 KB   the library -> LIBRARY folder
|   |-- TEPNMOS.LIB                                    17.9 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPRESISTOR.LIB                               306.9 KB   a part the demo uses -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPBJT.DLL                                    292.0 KB   its model -> MODELS folder
|   |-- TEPBULB.DLL                                   291.0 KB   the model -> MODELS folder
|   |-- TEPNMOS.DLL                                   295.0 KB   its model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|-- Proteus Simulation/
|   |-- Bulb_Demo.hex                                   9.3 KB   the demo firmware
|   |-- Filament-Bulbs-ArduinoUnoV4.pdsprj             24.8 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPBJT.DLL                                    292.0 KB   copy of its model
|   |-- TEPBULB.DLL                                   291.0 KB   copy of the model
|   |-- TEPNMOS.DLL                                   295.0 KB   copy of its model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|-- Arduino Code/
|   |-- Bulb_Demo/Bulb_Demo.ino                         2.2 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~14.1 KB   this file
Total: 4.65 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
Three incandescent bulbs, drawn at true scale from the side, base down, their two contacts as pins:
  * W5W - 12 V 5 W, a T10 all-glass wedge bulb (10 mm glass): 50 lm, the side lights and number
    plates of cars.
  * P21W - 12 V 21 W on a BA15s base (26.5 mm glass, 52.5 mm long): 460 lm, the brake and indicator
    lights.
  * #47 - 6.3 V 0.15 A miniature on a BA9s base (T-3 1/4, 10 mm glass): the pilot lamp of panels and
    old radios, 3000 hours.
  * One analog model: a tungsten filament whose resistance follows its temperature (about 14 times
    lower cold than hot), heated by its current
    and cooled by radiation and its lead-in wires, with its heat capacity. So it draws a surge of 12
    to 15 times its current at switch-on,
    warms in tens of milliseconds, smooths PWM, glows in its temperature's colour on the sheet, and
    follows the lamp laws: light ~ V^3.4,
    life ~ V^-13. Over-run, it burns out.
  * Click one at Run for the pop-up: the glowing bulb, the current of its last switch-on, graphs, an
    event log and a check page.
The body is drawn as on the real part and to true scale against our Arduino.
The TEP signature and the pop-up are TEP additions.

THREE DEVICES (search "BULB", "W5W", "P21W" or "#47" in Pick Devices):
  BULBW5WTEP   "W5W 12V 5W Bulb V1.0" in TEPBULB.LIB (Optoelectronics > Lamps), prefix L, model
  TEPBULB.DLL. Pins 1, 2 (no polarity).
  BULBP21WTEP  "P21W 12V 21W Bulb V1.0" in TEPBULB.LIB, prefix L, model TEPBULB.DLL. Pins 1, 2.
  BULB47TEP    "#47 6.3V 0.15A Bulb V1.0" in TEPBULB.LIB, prefix L, model TEPBULB.DLL. Pins 1, 2.

THE POP-UP
Click the part at Run. Tabs:
    Bulb      the bulb with its filament glowing at its temperature, the current of its last
    switch-on (400 ms, with its peak and where it
              settled, and when the light reached 90 %), and eight live values: voltage, current,
              power, resistance (and cold), the filament's
              temperature, the light in lumens, the surge, the life against rated. While PWM drives
              it the values are averages.
              The toolbar: New bulb, its rating and resistances.
    Graphs     the live values over the last 2, 6 or 15 s. Live / Freeze.
    Event log  every change and warning; filters All / Changes / Warnings, Pause, Clear
    Check      what the part is doing and what to look at, each with a verdict (green = fine, amber
    = check, red = wrong)
    Settings   theme, text size, open at Run, window size
    Help       report a bug, suggest a feature, article, updates, donate, forum; Copy diagnostics
    for a bug report

TEST STATUS
V1.0: verified in Proteus 8.5 on 31 Oct 2026 (the demo project as shipped: an A4 sheet, an Arduino UNO V4.0).
What the runs showed (the model's own numbers and the sketch's monitor):
  * The project loads and starts cleanly. Before the runs, the filament was checked in a separate
    solver against the lamp laws: at 80 % of
    its voltage a bulb gives 47 % of its light (0.8^3.4), 0.88 of its current (0.8^0.55) and 17
    times its life (0.8^-13).
  * L1 (W5W, switched hard by an IRLZ44N): a switch-on surge of 5.75 A, 13.8 x the 0.417 A it
    settles at; full light after 116 ms;
    then 11.99 V, 4.99 W, 2699 K, 50 lm. Cold 2.06 ohm, hot 28.8 ohm.
  * L2 (W5W, PWM soft start over 300 ms): the cold filament still saw pulses of 5.75 A, but their 4
    ms average never passed 0.61 A,
    1.5 x the running current; full light after 280 ms. Dimmed to 40 % (490 Hz): 2210 K and 9 lm -
    18 % of its light from 40 % of the time.
  * L3 (P21W, switched hard): a surge of 24.8 A, 14.2 x its 1.75 A; full light after 228 ms; 20.9 W,
    2846 K, 455 lm. Switched off, it was
    still at 1986 K and 20 lm moments later; switched on again from 911 K, its surge was only 6.79 A
    (3.9 x).
  * L4 (#47 on the 5 V rail through a 2N2222A): 4.92 V, 133 mA, 2206 K, 2.5 lm - 40 % of its light
    for about 32 times its life. Its surge was
    held near 378 mA (2.8 x) by the transistor, whose 1k base resistor gives it no more.
  * The pop-up: Bulb (the glowing bulb, the last switch-on's current), Graphs, Event log, Check -
    all four pages followed the run, for all four
    bulbs; the monitor printed every step.

INSTALLATION (about 2 minutes)
1. Close Proteus. Extract the WHOLE ZIP to a normal folder (e.g. Desktop).
2. Copy everything in "Proteus Library Files" (TEPBULB.LIB, TEPRESISTOR.LIB, TEPNMOS.LIB, TEPBJT.LIB
and our Arduino library V4.0, ArduinoV4TEP.LIB, with the ARDUINO UNO V4.0 used by the demo) to the
LIBRARY folder of Proteus, for example:
     C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\LIBRARY
   (use the folder that already holds Proteus's own .LIB files).
3. Copy TEPBULB.DLL, TEPRESISTOR.DLL, TEPNMOS.DLL, TEPBJT.DLL and TEPARDUINO.DLL from "Proteus Model
Files" to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPBULB.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "BULB, W5W, P21W or #47".

RUN THE DEMO
"Proteus Simulation\Filament-Bulbs-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file and the
DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Bulb_Demo.hex, its serial monitor built in (window "TEP Arduino
  UNO - ARD1").
  L1 W5W:  +12V - L1 - Q1 IRLZ44N (D9 - R1 220 - gate)       switched hard
  L2 W5W:  +12V - L2 - Q2 IRLZ44N (D10 - R2 220 - gate)      PWM soft start, then dimmed
  L3 P21W: +12V - L3 - Q3 IRLZ44N (D11 - R3 220 - gate)      switched hard
  L4 #47:  +5V - L4 - Q4 2N2222A (D8 - R4 1k - base)         run under its voltage
  1. Press Run. Every 4 s: all on (L2 soft-started over 300 ms) for 2 s / L2 dimmed to 40 % for 1 s
  / all off for 1 s.
  2. Open L1's and L2's pop-ups: the same bulb, a 13.8 x surge against a gentle 1.5 x.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  +V - bulb - drain of an N-MOSFET (or collector of an NPN); source / emitter to GND; pin - 220 ohm
  - gate
  size the switch for the surge, 12 to 15 x the running current, or soft-start it with PWM
REAL HARDWARE:
 * A cold filament has about a fourteenth of its hot resistance: plan for the surge.
 * The lamp laws: 5 % under its voltage, a bulb lives about twice as long and gives about 16 % less
   light; 5 % over, half the life.
 * PWM at a few hundred hertz dims a bulb without visible flicker: the filament's heat smooths it -
   but light falls much faster than duty.
 * A small transistor with too little base current limits the surge, and heats while it does.

THE DEMO SKETCH ON THE SERIAL MONITOR (Bulb_Demo V1.0, 9600 baud)
There are no commands. The sketch runs its 4 s cycle and prints each step.
EXPECTED MONITOR OUTPUT
  Filament bulbs - The Engineering Projects
  Step 1: all on - L1 and L3 switched hard, L2 soft-started
  Step 2: L2 dimmed to 40 %

PROPERTIES (double-click the part > Edit Properties)
  Part (VALUE)                     W5W 12V 5W, P21W 12V 21W or #47 6.3V 0.15A (the label; the device
  sets the bulb)
Every run starts again from the properties.

LINKS.INI (OPTIONAL)
The Help page cards of the pop-up open web pages. To point them somewhere else without a new DLL,
put a text file named links.ini next to TEPBULB.DLL with lines KEY=URL, for example:
  ARTICLE=https://www.theengineeringprojects.com/...
Keys: WEBSITE, FORUM, BUG_REPORT, FEATURE_REQUEST, ARTICLE, USER_GUIDE,
UPDATE_CHECK, DONATE. Only http:// and https:// links are used; lines starting
with # are comments.

TROUBLESHOOTING
* No light: the switch is not on, or the bulb has burnt out - its pop-up says BURNT OUT; New bulb
  fits another.
* The switch overheats at each switch-on: the surge - a bigger switch, or a PWM soft start.
* Dim and long-lived: the bulb is under-run - check the supply against its rating.
* BURNT OUT: it was over-run - keep it at or under its voltage.
* The part is not simulated: TEPBULB.DLL is missing from MODELS and from the project folder. No UNO
  / no monitor window: TEPARDUINO.DLL is missing, or click the UNO's USB port.

BUG REPORTS AND FEATURE REQUESTS
Please post them in our forum with a screenshot, the Serial Monitor text, the
simulation log and the pop-up's Copy diagnostics text:
  https://www.theengineeringprojects.com/forum/category/filament-bulb-proteus-library

SUPPORT US
This library is free. If it saves you time, please support our work:
  https://www.theengineeringprojects.com/donate

WEBSITE
  https://www.theengineeringprojects.com/

LICENCES AND THIRD-PARTY NOTES
* The model (TEPBULB.DLL), the symbols and artwork, the other parts of ours in the demo and the
  Arduino Library V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, with its built-in TEP Serial Monitor
  Advance) are made by The Engineering Projects. The models use only standard Windows libraries; no
  Visual C++ redistributable is needed.
  The C++ source code is not included.
* Arduino UNO V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, our Arduino Library V4.0 - its
  microcontroller is Proteus's own AVR model): The Engineering Projects,
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
* The .hex file is built from the demo sketch and the Arduino AVR core 1.8.6, which includes
  LGPL-licensed code; its source code is available at
  https://github.com/arduino/ArduinoCore-avr/tree/1.8.6
* Proteus is a product of Labcenter Electronics and is not included. Arduino is a trademark of Arduino SA.
  This library is not made or endorsed by Arduino or Labcenter.

REBUILDING THE FIRMWARE (OPTIONAL)
The HEX file is supplied; Arduino IDE is not needed to run the demo. To edit the sketch, open
Arduino Code\Bulb_Demo\Bulb_Demo.ino, select Arduino Uno and use Sketch > Export Compiled Binary.
Replace the simulation's .hex with the exported HEX. The sketch needs 3,358 bytes of flash and 205
bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: tungsten's resistance against temperature, radiation and conduction losses, the heat
capacity (the surge, the warm-up, the cooling,
PWM smoothing), the light and the life by the lamp laws, the burn-out.
Not modelled: the colour of the light beyond the glow, the filament's slow thinning with age, the
gas inside the bulb. The warm-up times come
from typical bulbs, not a datasheet figure.

VERSION
TEP Filament Bulb library V1.0 (Nov 2026). Devices BULBW5WTEP, BULBP21WTEP and BULB47TEP
(TEPBULB.LIB / TEPBULB.DLL). Demo sketch Bulb_Demo V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino
Library V4.0) with its built-in serial monitor.