Adorama Darkroom Safelight Replacement Bulb, 15 Watts, for Most Safe Lights.

Andrew R  I'm not sure I understand your question. These are standard 15 watt frosted incandescent light bulbs, suitable for use in most darkroom safelights.

ELIZABETH C  If your safelight has a red cover, the white bulbs are fine. If not, you need a red bulb.

VITO B  White should work as long as you have an amber or red filter on your lamp housing.

JASON P  This is a replacement bulb for a safe light. This bulb goes in a housing that has a red, orange or green cover.