Product Overview
Philips 31504-4 13528 (Type) – 15W / 6V Photo Projection Lamp, GZ4 Base
The Philips 31504-4 (13528 (Type)) is a 15-watt, 6-volt photo projection / instrument lamp with a GZ4 base and MR11 bulb, rated for a 500-hour average life in the BD±105° burning position. This lamp is stocked by ADL Supply for AV, projection, and instrument-lighting replacement programs.
WATTAGE 15W Photo Projection Lamp | VOLTAGE 6V Rated voltage | RATED LIFE 500 hrs Average life | BASE GZ4 MR11 bulb | CCT Not published Color temperature |
Technical Specifications
| Manufacturer | Philips (Signify) |
| Product Line | Photo Projection Lamps |
| ANSI / Type Code | 13528 (Type) |
| Product Number | 31504-4 |
| Wattage | 15W |
| Voltage | 6V |
| Bulb Shape | MR11 |
| Base | GZ4 |
| Packaging Quantity | 360 per case |
| Rated Average Life | 500 hours |
| Coil / Filament Type | C-6 |
| MOL (Maximum Overall Length) | 38.0 mm |
| Rated Approx. Lumens | Not published |
| Color Temperature | Not published |
| Operating / Burning Position | BD±105° |
Product Overview
The 31504-4 (13528 (Type)) is a low-voltage halogen lamp from Philips' Photo Projection Lamps line, built for precise, repeatable output in projection, photographic, and instrument applications. It is rated for bd±105° burning position and a 500-hour average life at 6V.
Photo projection lamps are precision-manufactured to tight filament and envelope tolerances so that beam pattern and color are consistent from lamp to lamp; always confirm the ANSI/type code and voltage against your equipment's original lamp specification before ordering, as many lamps in this family share similar bases and wattages across different voltages.
Compatible Applications
- Slide, movie, and overhead projectors
- Microscope and instrument illumination
- Photographic and audiovisual equipment
- Medical, dental, and scientific instrument lighting
- Retrofit replacement in fixtures originally specified for this ANSI/type code
Before Ordering – Verify
- Confirm the ANSI/type code (13528 (Type)) and voltage (6V) against your equipment's original lamp specification — this lamp family includes many similar-looking lamps that share a base and wattage but differ in voltage.
- Confirm base type (GZ4) and bulb shape (MR11) match your equipment's lamp socket/reflector.
- Confirm burning position (BD±105°) is compatible with your fixture's mounting orientation.
Safety and Handling Guidelines
- Turn power off before inspection, installation, or removal of the lamp.
- Allow the lamp to cool completely before handling or relamping — these lamps operate at high filament and envelope temperature.
- Do not touch the bulb envelope with bare hands; oils can cause premature failure and hot spots. Handle by the base wherever possible.
- Do not use the lamp if the outer glass is scratched or broken.
- Do not exceed rated voltage; overvoltaging shortens life and increases the risk of premature failure.
Compliance
- Dispose of/recycle according to federal, state, and local regulations for lamp components.
- Confirm ANSI/type code 13528 (Type) matches your equipment documentation before installation.
Ordering Information
- ANSI / Type Code: 13528 (Type)
- Product Number: 31504-4
- Packaging: 360 per case
- Contact ADL Supply for current wholesale pricing and stock availability.
For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.
