Could these be used as spot lights for a small event with a stage?

Yes， you can. This light have 120 RGB colors+ Warm white light, and the brightness can be adjusted. It can meet your multiple uses.

Do these lights make a true blue color dark blue not purple-ish

YES, these lights can make a true blue color. In order for this to happen, once you tap the blue button on the remote, tap it another three times and it will make your lights a true blue color. With one tap only on the blue tab it won’t change it to a true blue. But if you continue to tap the tab it will continue to darken to a true blue color. These lights work GREAT! I have six of them due to them being the best lights I’ve been able to find on Amazon!

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Specifications

Brand	MELPO
Color	Multicolor
Material	Aluminum， Glass
Light fixture form	Floodlight
Room Type	Garage
Product Dimensions	7.4"L x 1.46"W x 7.48"H
Specific Uses For Product	Garage, Garden, Patio
Indoor/Outdoor Usage	Outdoor
Power Source	Corded Electric
Installation Type	Wall Mount
Special Feature	50W, 5000ML, Dimmable, IP66 Waterproof, Stage lights, Uplights,Strobe, Spotlights, Timer, Custom Mode (DIY flash), halloween lights outdoor, halloween decorations outdoor
Control Method	Remote
Light Source Type	LED
Finish Type	Brushed
Shade Material	Aluminum, Glass
Number of Light Sources	2
Voltage	110 Volts (AC)
Theme	Rainbow
Light Color	RGB LED
Shape	Rectangular
Included Components	Remote Control
Lighting Method	Uplight, Downlight, Adjustable
Item Weight	3.39 Pounds
Number of Items	2
Wattage	40 watts
Controller Type	Remote Control
Switch Type	Push Button
Unit Count	2 Count
Water Resistance Level	Water Resistant
Brightness	5000 Lumen
Efficiency	100 LPW
Mounting Type	Wall Mount
Fixture Type	Non Removable
Assembly Required	No
Manufacturer	MELPO
Size	2 Pack
Recommended Uses For Product	RGB led flood lights for stage lights, led up lights, landscape lighting, backdrop lighting, outdoor strobe light, spot light. and you can use it to decorate your Christmas, Halloween, weddings, garden and so on. We can set schedules to automatically turn on and off the light as routines, install this RGB flood light in outdoor or indoor environment such as a porch, driveway, backyard, balcony, pergola, patio, garden.
Model Name	Portable luminaires
Item Weight	3.39 pounds
Item model number	BLFL-LFBA
Finish types	Brushed
Special Features	50W, 5000ML, Dimmable, IP66 Waterproof, Stage lights, Uplights,Strobe, Spotlights, Timer, Custom Mode (DIY flash), halloween lights outdoor, halloween decorations outdoor
Plug Format	A- US style
Batteries Required?	No
Color Temperature	2700 Kelvin