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The HPL 550/77 is a 550W 77V Halogen light bulb with a Medium Bipin With Heat Sink Single Ended Base. The HPL is a series developed for the ETC Source Four fixture.
Product Specifications:
| Product Series | HPL |
| Prod. ID / ANSI Code | HPL-575/115V+ |
| Description | HPL-575/115V+, JS115V-575WC, 300 Hour |
| Description 2 | 575W 115V |
| Item Type | Halogen |
| Base | HT/SNK |
| Voltage | 115 |
| Wattage | 575 |
| Burn Position | ANY |
| Bulb Shape | T6 |
| Bulb Finish | CLEAR |
| Color Temp (K) | 3250 |
| Efficacy (lm/W) | 28.7 |
| Filament | 4-C8 |
| Front Glass Cover | NO |
| Initial Lumens (lm) | 16520 |
| Luminous Flux (lm) | 16520 |
| Life (hr) | 300 |
| Diameter (mm) | 18.35 |
| MOL (mm) | 104 |
| Light Center Length (mm) | 60.3 |
| Case Qty | 10 |
