---
title: "Bulb mode"
slug: "bulb-mode"
updated: 2024-07-04T11:10:20Z
published: 2024-07-04T11:10:20Z
canonical: "docs-linescan.alliedvision.com/bulb-mode"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs-linescan.alliedvision.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bulb mode

In the Bulb mode the XLC4 control unit behaves like a classical bulb lamp. When the power supply in on the LEDs are switched on.

Use the bulb mode for a certain amount of lighting, for example switching the LEDs on once per day.

Do not use it for flashing applications.

| Parameter | Value |
| --- | --- |
| cuPar.WorkingMode | 0 |

The XLC4 control unit provides constant output currents for all 4 output channels. The amount of output currents is preset by a command and stored permanently in the registers cuPar.DefaultCurrent[0…3].

Change the content of the registers with the command IY:

- IY , [channel] , current , “W” |
- IY , current , current , current , current , “W