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FL58W835… What does the code on my tube mean?

That code is directly affiliated with that tube, we can work out what type of bulb we have by breaking down the code.

Firstly we can tell it's a fluorescent light because of the 'FL'.

We can also see it's 58 watt because of the '58w', generally if you have a number before a 'w' it indicates the wattage.

Finally 835 which is the colour code, this translates into a colour temprature, in this intance it's 3500 kelvin which is white.

Please see our guide for colour code conversion.

**Colour Code****Colour****Colour Temperature
(kelvin)** </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 827 </td> <td style="border: 1px solid #000000; text-align: center;"> Very Warm Triphosphor </td> <td style="border: 1px solid #000000; text-align: center;"> 2700k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 29 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm White </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 30 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm White </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 930 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm Multiphosphor </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 129 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm White </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 83 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm White </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> </tbody> </table> </td> <td style="width: 50px;">&nbsp;</td> <td valign="top"> <table border="1" cellpadding="2" cellspacing="2"> <tbody> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> **Colour Code** </td> <td style="border: 1px solid #000000; text-align: center;"> **Colour** </td> <td style="border: 1px solid #000000; text-align: center;"> **Colour Temperature (kelvin)** </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 830 </td> <td style="border: 1px solid #000000; text-align: center;"> Warm White Triphosphor </td> <td style="border: 1px solid #000000; text-align: center;"> 3000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 35 </td> <td style="border: 1px solid #000000; text-align: center;"> White </td> <td style="border: 1px solid #000000; text-align: center;"> 3500k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 835 </td> <td style="border: 1px solid #000000; text-align: center;"> White </td> <td style="border: 1px solid #000000; text-align: center;"> 3500k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 135 </td> <td style="border: 1px solid #000000; text-align: center;"> White Triphosphor </td> <td style="border: 1px solid #000000; text-align: center;"> 3500k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 23 </td> <td style="border: 1px solid #000000; text-align: center;"> White </td> <td style="border: 1px solid #000000; text-align: center;"> 3500k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 133 </td> <td style="border: 1px solid #000000; text-align: center;"> Cool White </td> <td style="border: 1px solid #000000; text-align: center;"> 4000k </td> </tr> </tbody> </table> </td> <td style="width: 50px;">&nbsp;</td> <td valign="top"> <table border="1" cellpadding="2" cellspacing="2"> <tbody> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> **Colour Code** </td> <td style="border: 1px solid #000000; text-align: center;"> **Colour** </td> <td style="border: 1px solid #000000; text-align: center;"> **Colour Temperature (kelvin)** </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 840 </td> <td style="border: 1px solid #000000; text-align: center;"> Cool White Triphosphor </td> <td style="border: 1px solid #000000; text-align: center;"> 4000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 84 </td> <td style="border: 1px solid #000000; text-align: center;"> Cool White </td> <td style="border: 1px solid #000000; text-align: center;"> 4000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 33 </td> <td style="border: 1px solid #000000; text-align: center;"> Cool White </td> <td style="border: 1px solid #000000; text-align: center;"> 4000k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;">860/865</td> <td style="border: 1px solid #000000; text-align: center;">Daylight Triphosphor</td> <td style="border: 1px solid #000000; text-align: center;">6000k</td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 54 </td> <td style="border: 1px solid #000000; text-align: center;"> Daylight </td> <td style="border: 1px solid #000000; text-align: center;"> 6500k </td> </tr> <tr valign="TOP"> <td style="border: 1px solid #000000; text-align: center;"> 11 </td> <td style="border: 1px solid #000000; text-align: center;"> Daylight </td> <td style="border: 1px solid #000000; text-align: center;"> 6500k </td> </tr> </tbody> </table> </td> </tr> </tbody>