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Glow Inc.

Which Green?


Which Green?

Due to its efficiency, green glow in the dark products are preferred.  To meet the needs of our various customers, we now stock eleven different green phosphorescent pigments and their associated glow in the dark paints.  This guide is intended to assist the purchaser in buying the correct product.

Product Part Number Brightness 10min (mcd/m2) Brightness 60min (mcd/m2) Grade Particle Size (micron)
Ultra Green V10 PDPGA 945 126 Grade 0 55-85
Ultra Green V10-B PDZGB 798 105 Grade 0 35-65
Ultra Green V10-C PDZGC 646 85 Grade 0 15-35
Ultra Green V10-D PDZGD 454 60 Grade 0 10-20
Ultra Green V10-E PDZGE 262 35 Grade 0 5-15
Ultra Green V10-F PDZGF 196 25 Grade 0 2-8
Ultra Green PDUG 607 80 Grade 1 35-65
Green PDEG 319 41 Grade 5 15-40
V10 Coated PCPG 945 126 Grade 0 56-86
Daytime Green PDDG 320 38 Grade 3 20-40
Green Sand PSUG ~400 ~40 Grade 3 250-500


Green strontium aluminate phosphorescent pigment is currently sold in 7 grades.  At the wholesale level, the difference is brightness vs. cost.  As you can see from above, there is a large difference in brightness between grades.  Over 98% of phosphorescent material produced is Grade 4 and 5, which is available from dozens of discount sources.  Glow Inc. purchases over 90% of the Grade 0 manufactured in the world.  


Phosphorescent pigments are not a dye.  They maintain their original shape and they do not color the medium around them.  Larger particles, within a grade, are brighter.  However, larger particle sizes create rough textured surfaces.  On thin applications, they can also create a speckled look when observed closely.  Therefore, smaller particle sizes look and feel smoother at the cost of brightness.  Additionally, smaller particle sizes are more likely to work in air brushes and printers.  Smaller particle sizes are also less likely to settle in their medium.

For an in-depth examination of the speckled appearance when using large particles, consider reading our technical article "The Grainy Issue".

Note:  It is a common misconception that all strontium aluminate pigments are of similar grade and that particle size is the sole determinant of brightness.  Another myth is that grade is the same as particle size.  As you can see from the chart above, this is not true.  A comparison of our Sample Pack to other manufacturers will quickly show which grade they are selling.


Bright white backgrounds are less likely to show the above-mentioned speckled appearance for large particle pigments.  White will also reflect the glow on thin applications, improving performance.  If possible, stay clear from dark backgrounds.


Coated Pigments have a thin protective layer added to each individual particle.  This prevents them from dissolving in water or being damaged by some acids.  They are also more durable.


Daytime powders are a mix of phosphorescent pigment and fluorescent pigment.  The result is a product that glows in the dark in one color and is vibrant in the light in different color.


Glow Inc. has always been at the forefront of providing free technical information on the subject of "glow in the dark".  However, we are in desperate need of exposure on the Internet.  If you enjoyed this article, please consider putting a link to it on your website, blog, or your favorite forum.